{ "document": { "aggregate_severity": { "namespace": "https://access.redhat.com/security/updates/classification/", "text": "Important" }, "category": "csaf_security_advisory", "csaf_version": "2.0", "distribution": { "text": "Copyright © Red Hat, Inc. All rights reserved.", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "summary", "text": "An update for gnutls is now available for Red Hat Enterprise Linux 9.\n\nRed Hat Product Security has rated this update as having a security impact of\nModerate. A Common Vulnerability Scoring System (CVSS) base score, which gives a\ndetailed severity rating, is available for each vulnerability from the CVE\nlink(s) in the References section.", "title": "Topic" }, { "category": "general", "text": "The gnutls packages provide the GNU Transport Layer Security (GnuTLS) library,\nwhich implements cryptographic algorithms and protocols such as SSL, TLS, and\nDTLS.\n\nSecurity Fix(es):\n\n* gnutls: Fix qsort comparator in DTLS reassembly (CVE-2026-42009)\n* gnutls: Fix crashing on an underflow with a DTLS datagram\n(CVE-2026-33845)\n* gnutls: Fix RSA-PSK identity truncation (CVE-2026-42010)\n* gnutls: Fix case-sensitivity of domain name comparison in name\nconstraints (CVE-2026-3833)\n* gnutls: Fix intersecting empty name constraints (CVE-2026-42011)\n* gnutls: Denial of Service via heap buffer overflow in DTLS handshake\nfragment reassembly (CVE-2026-33846)\n\nFor more details about the security issue(s), including the impact, a CVSS\nscore, acknowledgments, and other related information, refer to the CVE page(s)\nlisted in the References section.", "title": "Details" }, { "category": "legal_disclaimer", "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://access.redhat.com/security/team/contact/", "issuing_authority": "Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.", "name": "Red Hat Product Security", "namespace": "https://www.redhat.com" }, "references": [ { "category": "self", "summary": "https://access.redhat.com/errata/RHSA-2026:20612", "url": "https://access.redhat.com/errata/RHSA-2026:20612" }, { "category": "external", "summary": "https://access.redhat.com/security/updates/classification/#important", "url": "https://access.redhat.com/security/updates/classification/#important" }, { "category": "external", "summary": "2445763", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2445763" }, { "category": "external", "summary": "2450624", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450624" }, { "category": "external", "summary": "2450625", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450625" }, { "category": "external", "summary": "2467279", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467279" }, { "category": "external", "summary": "2467289", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467289" }, { "category": "external", "summary": "2467437", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467437" }, { "category": "external", "summary": "2467678", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467678" }, { "category": "self", "summary": "Canonical URL", "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_20612.json" } ], "title": "Red Hat Security Advisory: gnutls security update", "tracking": { "current_release_date": "2026-07-13T21:21:37+00:00", "generator": { "date": "2026-07-13T21:21:37+00:00", "engine": { "name": "Red Hat SDEngine", "version": "5.3.2" } }, "id": "RHSA-2026:20612", "initial_release_date": "2026-05-26T07:04:55+00:00", "revision_history": [ { "date": "2026-05-26T07:04:55+00:00", "number": "1", "summary": "Initial version" }, { "date": "2026-05-26T07:04:55+00:00", "number": "2", "summary": "Last updated version" }, { "date": "2026-07-13T21:21:37+00:00", "number": "3", "summary": "Last generated version" } ], "status": "final", "version": "3" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "Red Hat Enterprise Linux AppStream (v. 9)", "product": { "name": "Red Hat Enterprise Linux AppStream (v. 9)", "product_id": "AppStream-9.8.0.Z.MAIN.EUS", "product_identification_helper": { "cpe": "cpe:/a:redhat:enterprise_linux:9::appstream" } } }, { "category": "product_name", "name": "Red Hat Enterprise Linux BaseOS (v. 9)", "product": { "name": "Red Hat Enterprise Linux BaseOS (v. 9)", "product_id": "BaseOS-9.8.0.Z.MAIN.EUS", 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"CWE-179", "name": "Incorrect Behavior Order: Early Validation" }, "discovery_date": "2026-03-09T13:41:32.810000+00:00", "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "2445762" } ], "notes": [ { "category": "description", "text": "A flaw was found in gnutls. A remote attacker could exploit this vulnerability by presenting a specially crafted Online Certificate Status Protocol (OCSP) response during a TLS handshake. Due to a logic error in how gnutls processes multi-record OCSP responses, a client with OCSP verification enabled may incorrectly accept a revoked server certificate, potentially leading to a compromise of trust.", "title": "Vulnerability description" }, { "category": "summary", "text": "gnutls: gnutls: Security bypass allows acceptance of revoked server certificates via crafted OCSP response", "title": "Vulnerability summary" }, { "category": "other", "text": "This issue has a LOW impact. A flaw in gnutls' OCSP stapling implementation allows a client with OCSP verification enabled to accept a revoked server certificate. This occurs when a multi-record OCSP response is stapled, and the client incorrectly reads the certificate status from an unrelated record, leading to an order-dependent acceptance of a revoked certificate.", "title": "Statement" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.aarch64", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.i686", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.ppc64le", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.s390x", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.x86_64", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-debuginfo-0:3.8.10-4.el9_8.aarch64", 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"references": [ { "category": "self", "summary": "Canonical URL", "url": "https://access.redhat.com/security/cve/CVE-2026-3832" }, { "category": "external", "summary": "RHBZ#2445762", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2445762" }, { "category": "external", "summary": "https://www.cve.org/CVERecord?id=CVE-2026-3832", "url": "https://www.cve.org/CVERecord?id=CVE-2026-3832" }, { "category": "external", "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-3832", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-3832" }, { "category": "external", "summary": "https://gitlab.com/gnutls/gnutls/-/issues/1801", "url": "https://gitlab.com/gnutls/gnutls/-/issues/1801" } ], "release_date": "2026-04-30T17:29:25.738000+00:00", "remediations": [ { "category": "vendor_fix", "date": "2026-05-26T07:04:55+00:00", "details": "Before applying this update, make sure all previously released errata\nrelevant to your system have been applied.\n\nFor details on how to apply this update, refer 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"BaseOS-9.8.0.Z.MAIN.EUS:gnutls-utils-debuginfo-0:3.8.10-4.el9_8.s390x", "BaseOS-9.8.0.Z.MAIN.EUS:gnutls-utils-debuginfo-0:3.8.10-4.el9_8.x86_64" ] } ], "threats": [ { "category": "impact", "details": "Low" } ], "title": "gnutls: gnutls: Security bypass allows acceptance of revoked server certificates via crafted OCSP response" }, { "cve": "CVE-2026-3833", "cwe": { "id": "CWE-178", "name": "Improper Handling of Case Sensitivity" }, "discovery_date": "2026-03-09T14:02:09.783000+00:00", "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "2445763" } ], "notes": [ { "category": "description", "text": "A flaw was found in gnutls. This vulnerability occurs because gnutls performs case-sensitive comparisons of `nameConstraints` labels, specifically for `dNSName` (DNS) or `rfc822Name` (email) constraints within `excludedSubtrees` or `permittedSubtrees`. A remote attacker can exploit this by crafting a leaf certificate with casing differences in the Subject Alternative Name (SAN), leading to a policy bypass where a certificate that should be rejected is instead accepted. This could result in unauthorized access or information disclosure.", "title": "Vulnerability description" }, { "category": "summary", "text": "gnutls: GnuTLS: Policy bypass due to case-sensitive nameConstraints comparison", "title": "Vulnerability summary" }, { "category": "other", "text": "This issue is particularly important because it affects the correct enforcement of X.509 nameConstraints, which are specifically designed to limit the authority of subordinate CAs. In GnuTLS, the use of case-sensitive comparisons (memcmp) for dNSName and the domain portion of rfc822Name violates the case-insensitive matching requirements defined in RFC 5280 and RFC 4343. As a result, a constrained subordinate CA can bypass excludedSubtrees or permittedSubtrees restrictions simply by changing the letter casing of a domain in the SAN (e.g., ExAmPlE.CoM vs example.com). Since nameConstraints are often the only mechanism enforcing domain boundaries in delegated PKI hierarchies, this flaw effectively allows a malicious or compromised sub-CA to issue certificates for domains that should be cryptographically prohibited, enabling unauthorized certificate validation and potential TLS impersonation of restricted services.", "title": "Statement" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.aarch64", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.i686", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.ppc64le", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.s390x", 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A remote attacker, by sending an extremely short premaster secret during an RSA key exchange to a server using an RSA key backed by a PKCS#11 token, could trigger a short heap overread. This memory corruption vulnerability could lead to information disclosure.", "title": "Vulnerability description" }, { "category": "summary", "text": "gnutls: gnutls: Information disclosure via heap overread in RSA key exchange", "title": "Vulnerability summary" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.aarch64", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.i686", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.ppc64le", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.s390x", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.x86_64", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-debuginfo-0:3.8.10-4.el9_8.aarch64", 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"references": [ { "category": "self", "summary": "Canonical URL", "url": "https://access.redhat.com/security/cve/CVE-2026-5260" }, { "category": "external", "summary": "RHBZ#2467450", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467450" }, { "category": "external", "summary": "https://www.cve.org/CVERecord?id=CVE-2026-5260", "url": "https://www.cve.org/CVERecord?id=CVE-2026-5260" }, { "category": "external", "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-5260", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-5260" }, { "category": "external", "summary": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-10", "url": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-10" } ], "release_date": "2026-04-29T00:00:00+00:00", "remediations": [ { "category": "vendor_fix", "date": "2026-05-26T07:04:55+00:00", "details": "Before applying this update, make sure all previously released errata\nrelevant to your system have been applied.\n\nFor details on how 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The PKCS#7 padding check, performed during decryption, was not constant-time. This timing side-channel could allow a remote attacker to potentially leak sensitive information about the padding bytes through observable timing differences. This vulnerability is a form of information disclosure.", "title": "Vulnerability description" }, { "category": "summary", "text": "gnutls: gnutls: Information disclosure via timing side-channel in PKCS#7 padding removal", "title": "Vulnerability summary" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.aarch64", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.i686", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.ppc64le", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.s390x", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.x86_64", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-debuginfo-0:3.8.10-4.el9_8.aarch64", 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"references": [ { "category": "self", "summary": "Canonical URL", "url": "https://access.redhat.com/security/cve/CVE-2026-5419" }, { "category": "external", "summary": "RHBZ#2467686", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467686" }, { "category": "external", "summary": "https://www.cve.org/CVERecord?id=CVE-2026-5419", "url": "https://www.cve.org/CVERecord?id=CVE-2026-5419" }, { "category": "external", "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-5419", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-5419" }, { "category": "external", "summary": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-13", "url": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-13" } ], "release_date": "2026-04-29T00:00:00+00:00", "remediations": [ { "category": "vendor_fix", "date": "2026-05-26T07:04:55+00:00", "details": "Before applying this update, make sure all previously released errata\nrelevant to your system have been applied.\n\nFor details on how 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to an integer underflow during reassembly and resulting in an out-of-bounds read. This issue is remotely exploitable and may cause information disclosure or denial of service.", "title": "Vulnerability description" }, { "category": "summary", "text": "gnutls: GnuTLS: Denial of Service via DTLS zero-length fragment", "title": "Vulnerability summary" }, { "category": "other", "text": "This issue marked as Important severity due to its remote, pre-authentication reachability and its impact on a critical DTLS handshake parsing path. The vulnerability can be triggered by an unauthenticated attacker sending crafted DTLS handshake fragments, requiring no prior access or interaction. It leads to an out-of-bounds read caused by an integer underflow in fragment reassembly, operating entirely on attacker-controlled input. Such flaws in low-level protocol parsing are particularly serious, as they may result in disclosure of sensitive process memory, including cryptographic or session-related data, and can also cause reliable application crashes leading to denial of service. Given that DTLS is commonly used in network-facing services such as VPNs and real-time communication systems, the exposure surface is broad. The combination of unauthenticated remote exploitation, memory safety violation, and potential confidentiality and availability impact justifies classifying this issue as high severity rather than moderate.", "title": "Statement" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.aarch64", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.i686", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.ppc64le", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.s390x", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.x86_64", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-debuginfo-0:3.8.10-4.el9_8.aarch64", 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"references": [ { "category": "self", "summary": "Canonical URL", "url": "https://access.redhat.com/security/cve/CVE-2026-33845" }, { "category": "external", "summary": "RHBZ#2450624", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450624" }, { "category": "external", "summary": "https://www.cve.org/CVERecord?id=CVE-2026-33845", "url": "https://www.cve.org/CVERecord?id=CVE-2026-33845" }, { "category": "external", "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-33845", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33845" } ], "release_date": "2026-04-30T17:28:41.473000+00:00", "remediations": [ { "category": "vendor_fix", "date": "2026-05-26T07:04:55+00:00", "details": "Before applying this update, make sure all previously released errata\nrelevant to your system have been applied.\n\nFor details on how to apply this update, refer to:\n\nhttps://access.redhat.com/articles/11258", "product_ids": [ "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.aarch64", 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"threats": [ { "category": "impact", "details": "Important" } ], "title": "gnutls: GnuTLS: Denial of Service via DTLS zero-length fragment" }, { "cve": "CVE-2026-33846", "cwe": { "id": "CWE-130", "name": "Improper Handling of Length Parameter Inconsistency" }, "discovery_date": "2026-03-24T05:38:09.899000+00:00", "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "2450625" } ], "notes": [ { "category": "description", "text": "A heap buffer overflow vulnerability exists in the DTLS handshake fragment reassembly logic of GnuTLS. The issue arises in merge_handshake_packet() where incoming handshake fragments are matched and merged based solely on handshake type, without validating that the message_length field remains consistent across all fragments of the same logical message. An attacker can exploit this by sending crafted DTLS fragments with conflicting message_length values, causing the implementation to allocate a buffer based on a smaller initial fragment and subsequently write beyond its bounds using larger, inconsistent fragments. Because the merge operation does not enforce proper bounds checking against the allocated buffer size, this results in an out-of-bounds write on the heap. The vulnerability is remotely exploitable without authentication via the DTLS handshake path and can lead to application crashes or potential memory corruption.", "title": "Vulnerability description" }, { "category": "summary", "text": "gnutls: GnuTLS: Denial of Service via heap buffer overflow in DTLS handshake fragment reassembly", "title": "Vulnerability summary" }, { "category": "other", "text": "This vulnerability should be classified as an important flaw rather than moderate because it exposes a pre-authentication, remotely reachable heap buffer overflow in the DTLS handshake processing path, which is part of the core protocol handling logic and commonly exposed in network-facing services. The flaw enables an attacker to inject controlled data at attacker-chosen offsets and sizes beyond allocated heap boundaries by exploiting inconsistent message_length handling across fragments, effectively creating a constrained but meaningful heap write primitive. Unlike benign memory safety bugs, this condition is deterministically triggerable with a small number of crafted packets and no environmental dependencies for denial-of-service, and it targets a long-lived parsing state where memory corruption can affect adjacent heap structures. Even if reliable code execution requires additional heap manipulation or layout knowledge, the combination of remote reachability, lack of authentication, controlled memory corruption capability, and trivial crashability significantly elevates the risk profile beyond moderate severity. In real-world deployments, such primitives are often sufficient to enable heap grooming and exploitation chains, particularly in services that repeatedly process attacker-controlled input, making this a materially important security flaw.", "title": "Statement" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.aarch64", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.i686", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.ppc64le", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.s390x", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.x86_64", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-debuginfo-0:3.8.10-4.el9_8.aarch64", 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"references": [ { "category": "self", "summary": "Canonical URL", "url": "https://access.redhat.com/security/cve/CVE-2026-33846" }, { "category": "external", "summary": "RHBZ#2450625", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450625" }, { "category": "external", "summary": "https://www.cve.org/CVERecord?id=CVE-2026-33846", "url": "https://www.cve.org/CVERecord?id=CVE-2026-33846" }, { "category": "external", "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-33846", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33846" } ], "release_date": "2026-05-04T08:53:59.249000+00:00", "remediations": [ { "category": "vendor_fix", "date": "2026-05-26T07:04:55+00:00", "details": "Before applying this update, make sure all previously released errata\nrelevant to your system have been applied.\n\nFor details on how to apply this update, refer to:\n\nhttps://access.redhat.com/articles/11258", "product_ids": [ "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.aarch64", 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"threats": [ { "category": "impact", "details": "Important" } ], "title": "gnutls: GnuTLS: Denial of Service via heap buffer overflow in DTLS handshake fragment reassembly" }, { "acknowledgments": [ { "names": [ "Joshua Rogers" ], "organization": "AISLE Research Team" } ], "cve": "CVE-2026-42009", "cwe": { "id": "CWE-475", "name": "Undefined Behavior for Input to API" }, "discovery_date": "2026-05-06T16:32:32.382000+00:00", "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "2467279" } ], "notes": [ { "category": "description", "text": "A flaw was found in gnutls. A remote attacker could exploit an issue in the Datagram Transport Layer Security (DTLS) packet reordering logic. The comparator function, responsible for ordering DTLS packets by sequence numbers, did not correctly handle packets with duplicate sequence numbers. This could lead to unstable packet ordering or undefined behavior, resulting in a denial of service.", "title": "Vulnerability description" }, { "category": "summary", "text": "gnutls: gnutls: Denial of Service via DTLS packet reordering vulnerability", "title": "Vulnerability summary" }, { "category": "other", "text": "The impact for this flaw has been downgraded on Red Hat Enterprise Linux due to the following reason:\n\n- The number of elements passed to the vulnerable function at runtime is known and is at most 6 and the element size is sufficiently small. glibc’s qsort implementation will not exercise the quick sort code path, which would otherwise cause an infloop or out-of-bound write.", "title": "Statement" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } 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"title": "gnutls: gnutls: Denial of Service via DTLS packet reordering vulnerability" }, { "acknowledgments": [ { "names": [ "Joshua Rogers" ], "organization": "AISLE Research Team" } ], "cve": "CVE-2026-42010", "cwe": { "id": "CWE-170", "name": "Improper Null Termination" }, "discovery_date": "2026-05-06T16:57:37.044000+00:00", "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "2467289" } ], "notes": [ { "category": "description", "text": "A flaw was found in gnutls. Servers configured with RSA-PSK (Rivest–Shamir–Adleman – Pre-Shared Key) wrongfully matched usernames containing a NUL character with truncated usernames. A remote attacker could exploit this by sending a specially crafted username, leading to an authentication bypass. This vulnerability allows an attacker to gain unauthorized access by circumventing the authentication process.", "title": "Vulnerability description" }, { "category": "summary", "text": "gnutls: gnutls: Authentication Bypass via NUL Character in Username", "title": "Vulnerability summary" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.aarch64", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.i686", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.ppc64le", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.s390x", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.x86_64", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-debuginfo-0:3.8.10-4.el9_8.aarch64", 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"references": [ { "category": "self", "summary": "Canonical URL", "url": "https://access.redhat.com/security/cve/CVE-2026-42010" }, { "category": "external", "summary": "RHBZ#2467289", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467289" }, { "category": "external", "summary": "https://www.cve.org/CVERecord?id=CVE-2026-42010", "url": "https://www.cve.org/CVERecord?id=CVE-2026-42010" }, { "category": "external", "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-42010", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42010" }, { "category": "external", "summary": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-4", "url": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-4" } ], "release_date": "2026-04-29T00:00:00+00:00", "remediations": [ { "category": "vendor_fix", "date": "2026-05-26T07:04:55+00:00", "details": "Before applying this update, make sure all previously released errata\nrelevant to your system have been applied.\n\nFor details on 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This vulnerability occurs because permitted name constraints were incorrectly ignored when previous Certificate Authorities (CAs) only had excluded name constraints. A remote attacker could exploit this to bypass critical name constraint checks during certificate validation. This bypass could lead to the acceptance of invalid certificates, potentially enabling spoofing or man-in-the-middle attacks against affected systems.", "title": "Vulnerability description" }, { "category": "summary", "text": "gnutls: gnutls: Security bypass due to incorrect name constraint handling", "title": "Vulnerability summary" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.aarch64", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.i686", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.ppc64le", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.s390x", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.x86_64", 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Hat Bugzilla ID", "text": "2467441" } ], "notes": [ { "category": "description", "text": "A flaw was found in gnutls. A remote attacker could exploit this vulnerability by presenting a specially crafted certificate that contains Uniform Resource Identifier (URI) or Service (SRV) Subject Alternative Names (SANs). This could cause the certificate validation process to incorrectly fall back to checking DNS hostnames against the Common Name (CN), potentially allowing the attacker to spoof legitimate services or intercept sensitive information.", "title": "Vulnerability description" }, { "category": "summary", "text": "gnutls: gnutls: Certificate validation bypass due to improper handling of URI and SRV SANs", "title": "Vulnerability summary" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.aarch64", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.i686", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.ppc64le", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.s390x", 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Validation" }, "discovery_date": "2026-05-06T19:47:00.134000+00:00", "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "2467448" } ], "notes": [ { "category": "description", "text": "A flaw was found in gnutls. When validating certificates, an oversized Subject Alternative Name (SAN) could cause the validation process to incorrectly fall back to checking the Common Name (CN) field. This could allow a remote attacker to bypass proper certificate validation, potentially leading to spoofing or man-in-the-middle attacks.", "title": "Vulnerability description" }, { "category": "summary", "text": "gnutls: gnutls: Certificate validation bypass due to oversized Subject Alternative Name", "title": "Vulnerability summary" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.aarch64", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.i686", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.ppc64le", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.s390x", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.x86_64", 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"2026-05-06T19:51:54.069000+00:00", "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "2467451" } ], "notes": [ { "category": "description", "text": "A flaw was found in GnuTLS. The `gnutls_pkcs11_token_set_pin` function, used for changing the Security Officer PIN, can lead to a use-after-free vulnerability. This occurs when an attacker attempts to change the PIN with a NULL old PIN for a token that lacks a protected authentication path.", "title": "Vulnerability description" }, { "category": "summary", "text": "gnutls: gnutls: Use-after-free in gnutls_pkcs11_token_set_pin", "title": "Vulnerability summary" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.aarch64", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.i686", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.ppc64le", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.s390x", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.x86_64", 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"system_name": "Red Hat Bugzilla ID", "text": "2467678" } ], "notes": [ { "category": "description", "text": "A flaw was found in gnutls. An off-by-one error exists in the PKCS#12 bag element bounds check. This vulnerability allows an remote attacker to write past the internal array of a PKCS#12 bag when appending to a bag that already contains 32 elements. This memory corruption could lead to a denial of service (DoS) or potentially other unspecified impacts.", "title": "Vulnerability description" }, { "category": "summary", "text": "gnutls: gnutls: Memory corruption due to off-by-one error in PKCS#12 bag handling", "title": "Vulnerability summary" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.aarch64", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.i686", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.ppc64le", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.s390x", "AppStream-9.8.0.Z.MAIN.EUS:gnutls-c++-0:3.8.10-4.el9_8.x86_64", 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