{ "document": { "aggregate_severity": { "namespace": "https://access.redhat.com/security/updates/classification/", "text": "Important" }, "category": "csaf_vex", "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": "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": "Canonical URL", "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3593.json" } ], "title": "bind: Heap use-after-free vulnerability in BIND 9 DNS-over-HTTPS implementation", "tracking": { "current_release_date": "2026-06-30T03:51:24+00:00", "generator": { "date": "2026-06-30T03:51:24+00:00", "engine": { "name": "Red Hat SDEngine", "version": "5.3.0" } }, "id": "CVE-2026-3593", "initial_release_date": 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"red_hat_enterprise_linux_9:python3-bind", "red_hat_openshift_container_platform_4:rhcos" ] }, { "label": "vulnerable_code_not_in_execute_path", "product_ids": [ "red_hat_enterprise_linux_9:dhcp-client", "red_hat_enterprise_linux_9:dhcp-common", "red_hat_enterprise_linux_9:dhcp-relay", "red_hat_enterprise_linux_9:dhcp-server", "red_hat_enterprise_linux_9:dhcp.src" ] } ], "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "2479770" } ], "notes": [ { "category": "description", "text": "A flaw was found in the BIND (Berkeley Internet Name Domain) DNS-over-HTTPS implementation. A remote attacker could send specially crafted HTTP/2 traffic to a DNS-over-HTTPS endpoint, leading to a use-after-free vulnerability. This could trigger memory corruption, potentially allowing the attacker to cause a denial of service or, in some cases, execute arbitrary code.", "title": "Vulnerability description" }, { "category": "summary", "text": "bind: Heap use-after-free vulnerability in BIND 9 DNS-over-HTTPS implementation", "title": "Vulnerability summary" }, { "category": "other", "text": "Important: A heap use-after-free vulnerability in BIND's DNS-over-HTTPS implementation allows a remote attacker to trigger memory corruption by sending crafted HTTP/2 traffic to a DNS-over-HTTPS endpoint. This affects both authoritative servers and resolvers configured to use DNS-over-HTTPS, potentially leading to denial of service or other impacts.", "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": [ "Red Hat Hardened Images:bind-main@aarch64", "Red Hat Hardened Images:bind-main@noarch", "Red Hat Hardened Images:bind-main@src", "Red Hat Hardened Images:bind-main@x86_64" ], "known_not_affected": [ "red_hat_enterprise_linux_10:bind", "red_hat_enterprise_linux_10:bind-chroot", "red_hat_enterprise_linux_10:bind-devel", "red_hat_enterprise_linux_10:bind-dnssec-utils", "red_hat_enterprise_linux_10:bind-doc", "red_hat_enterprise_linux_10:bind-libs", "red_hat_enterprise_linux_10:bind-license", "red_hat_enterprise_linux_10:bind-utils", "red_hat_enterprise_linux_10:bind.src", "red_hat_enterprise_linux_6:bind", "red_hat_enterprise_linux_6:bind-chroot", "red_hat_enterprise_linux_6:bind-devel", "red_hat_enterprise_linux_6:bind-libs", "red_hat_enterprise_linux_6:bind-sdb", "red_hat_enterprise_linux_6:bind-utils", "red_hat_enterprise_linux_6:bind.src", "red_hat_enterprise_linux_7:bind", "red_hat_enterprise_linux_7:bind-chroot", "red_hat_enterprise_linux_7:bind-devel", "red_hat_enterprise_linux_7:bind-export-devel", "red_hat_enterprise_linux_7:bind-export-libs", "red_hat_enterprise_linux_7:bind-libs", "red_hat_enterprise_linux_7:bind-libs-lite", "red_hat_enterprise_linux_7:bind-license", "red_hat_enterprise_linux_7:bind-lite-devel", "red_hat_enterprise_linux_7:bind-pkcs11", "red_hat_enterprise_linux_7:bind-pkcs11-devel", "red_hat_enterprise_linux_7:bind-pkcs11-libs", "red_hat_enterprise_linux_7:bind-pkcs11-utils", "red_hat_enterprise_linux_7:bind-sdb", "red_hat_enterprise_linux_7:bind-sdb-chroot", "red_hat_enterprise_linux_7:bind-utils", "red_hat_enterprise_linux_7:bind.src", "red_hat_enterprise_linux_8:bind", "red_hat_enterprise_linux_8:bind-chroot", "red_hat_enterprise_linux_8:bind-devel", "red_hat_enterprise_linux_8:bind-export-devel", "red_hat_enterprise_linux_8:bind-export-libs", "red_hat_enterprise_linux_8:bind-libs", "red_hat_enterprise_linux_8:bind-libs-lite", "red_hat_enterprise_linux_8:bind-license", "red_hat_enterprise_linux_8:bind-lite-devel", "red_hat_enterprise_linux_8:bind-pkcs11", "red_hat_enterprise_linux_8:bind-pkcs11-devel", "red_hat_enterprise_linux_8:bind-pkcs11-libs", "red_hat_enterprise_linux_8:bind-pkcs11-utils", "red_hat_enterprise_linux_8:bind-sdb", "red_hat_enterprise_linux_8:bind-sdb-chroot", "red_hat_enterprise_linux_8:bind-utils", "red_hat_enterprise_linux_8:bind.src", "red_hat_enterprise_linux_8:bind9.16", "red_hat_enterprise_linux_8:bind9.16-chroot", "red_hat_enterprise_linux_8:bind9.16-devel", "red_hat_enterprise_linux_8:bind9.16-dnssec-utils", "red_hat_enterprise_linux_8:bind9.16-doc", "red_hat_enterprise_linux_8:bind9.16-libs", "red_hat_enterprise_linux_8:bind9.16-license", "red_hat_enterprise_linux_8:bind9.16-utils", "red_hat_enterprise_linux_8:bind9.16.src", "red_hat_enterprise_linux_8:python3-bind", "red_hat_enterprise_linux_8:python3-bind9.16", "red_hat_enterprise_linux_9:bind", "red_hat_enterprise_linux_9:bind-chroot", "red_hat_enterprise_linux_9:bind-devel", "red_hat_enterprise_linux_9:bind-dnssec-doc", "red_hat_enterprise_linux_9:bind-dnssec-utils", "red_hat_enterprise_linux_9:bind-doc", "red_hat_enterprise_linux_9:bind-libs", "red_hat_enterprise_linux_9:bind-license", "red_hat_enterprise_linux_9:bind-utils", "red_hat_enterprise_linux_9:bind.src", "red_hat_enterprise_linux_9:bind9.18", "red_hat_enterprise_linux_9:bind9.18-chroot", "red_hat_enterprise_linux_9:bind9.18-devel", "red_hat_enterprise_linux_9:bind9.18-dnssec-utils", "red_hat_enterprise_linux_9:bind9.18-doc", "red_hat_enterprise_linux_9:bind9.18-libs", "red_hat_enterprise_linux_9:bind9.18-utils", "red_hat_enterprise_linux_9:bind9.18.src", "red_hat_enterprise_linux_9:dhcp-client", "red_hat_enterprise_linux_9:dhcp-common", "red_hat_enterprise_linux_9:dhcp-relay", "red_hat_enterprise_linux_9:dhcp-server", "red_hat_enterprise_linux_9:dhcp.src", "red_hat_enterprise_linux_9:python3-bind", "red_hat_openshift_container_platform_4:rhcos" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://access.redhat.com/security/cve/CVE-2026-3593" }, { "category": "external", "summary": "RHBZ#2479770", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2479770" }, { "category": "external", "summary": "https://www.cve.org/CVERecord?id=CVE-2026-3593", "url": "https://www.cve.org/CVERecord?id=CVE-2026-3593" }, { "category": "external", "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-3593", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-3593" } ], "release_date": "2026-05-21T11:59:02.348000+00:00", "remediations": [ { "category": "vendor_fix", "date": "2026-04-10T18:39:00+00:00", "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/", "product_ids": [ "Red Hat Hardened Images:bind-main@aarch64", "Red Hat Hardened Images:bind-main@noarch", "Red Hat Hardened Images:bind-main@src", "Red Hat Hardened Images:bind-main@x86_64" ], "url": "https://access.redhat.com/errata/RHSA-2026:7412" }, { "category": "workaround", "details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.", "product_ids": [ "Red Hat Hardened Images:bind-main@aarch64", "Red Hat Hardened Images:bind-main@noarch", "Red Hat Hardened Images:bind-main@src", "Red Hat Hardened Images:bind-main@x86_64" ] } ], "scores": [ { "cvss_v3": { "attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H", "version": "3.1" }, "products": [ "Red Hat Hardened Images:bind-main@aarch64", "Red Hat Hardened Images:bind-main@noarch", "Red Hat Hardened Images:bind-main@src", "Red Hat Hardened Images:bind-main@x86_64", "red_hat_enterprise_linux_10:bind", "red_hat_enterprise_linux_10:bind-chroot", "red_hat_enterprise_linux_10:bind-devel", "red_hat_enterprise_linux_10:bind-dnssec-utils", "red_hat_enterprise_linux_10:bind-doc", "red_hat_enterprise_linux_10:bind-libs", "red_hat_enterprise_linux_10:bind-license", "red_hat_enterprise_linux_10:bind-utils", 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"red_hat_enterprise_linux_7:bind-utils", "red_hat_enterprise_linux_7:bind.src", "red_hat_enterprise_linux_8:bind", "red_hat_enterprise_linux_8:bind-chroot", "red_hat_enterprise_linux_8:bind-devel", "red_hat_enterprise_linux_8:bind-export-devel", "red_hat_enterprise_linux_8:bind-export-libs", "red_hat_enterprise_linux_8:bind-libs", "red_hat_enterprise_linux_8:bind-libs-lite", "red_hat_enterprise_linux_8:bind-license", "red_hat_enterprise_linux_8:bind-lite-devel", "red_hat_enterprise_linux_8:bind-pkcs11", "red_hat_enterprise_linux_8:bind-pkcs11-devel", "red_hat_enterprise_linux_8:bind-pkcs11-libs", "red_hat_enterprise_linux_8:bind-pkcs11-utils", "red_hat_enterprise_linux_8:bind-sdb", "red_hat_enterprise_linux_8:bind-sdb-chroot", "red_hat_enterprise_linux_8:bind-utils", "red_hat_enterprise_linux_8:bind.src", "red_hat_enterprise_linux_8:bind9.16", "red_hat_enterprise_linux_8:bind9.16-chroot", "red_hat_enterprise_linux_8:bind9.16-devel", "red_hat_enterprise_linux_8:bind9.16-dnssec-utils", "red_hat_enterprise_linux_8:bind9.16-doc", "red_hat_enterprise_linux_8:bind9.16-libs", "red_hat_enterprise_linux_8:bind9.16-license", "red_hat_enterprise_linux_8:bind9.16-utils", "red_hat_enterprise_linux_8:bind9.16.src", "red_hat_enterprise_linux_8:python3-bind", "red_hat_enterprise_linux_8:python3-bind9.16", "red_hat_enterprise_linux_9:bind", "red_hat_enterprise_linux_9:bind-chroot", "red_hat_enterprise_linux_9:bind-devel", "red_hat_enterprise_linux_9:bind-dnssec-doc", "red_hat_enterprise_linux_9:bind-dnssec-utils", "red_hat_enterprise_linux_9:bind-doc", "red_hat_enterprise_linux_9:bind-libs", "red_hat_enterprise_linux_9:bind-license", "red_hat_enterprise_linux_9:bind-utils", "red_hat_enterprise_linux_9:bind.src", "red_hat_enterprise_linux_9:bind9.18", "red_hat_enterprise_linux_9:bind9.18-chroot", "red_hat_enterprise_linux_9:bind9.18-devel", "red_hat_enterprise_linux_9:bind9.18-dnssec-utils", "red_hat_enterprise_linux_9:bind9.18-doc", "red_hat_enterprise_linux_9:bind9.18-libs", "red_hat_enterprise_linux_9:bind9.18-utils", "red_hat_enterprise_linux_9:bind9.18.src", "red_hat_enterprise_linux_9:dhcp-client", "red_hat_enterprise_linux_9:dhcp-common", "red_hat_enterprise_linux_9:dhcp-relay", "red_hat_enterprise_linux_9:dhcp-server", "red_hat_enterprise_linux_9:dhcp.src", "red_hat_enterprise_linux_9:python3-bind", "red_hat_openshift_container_platform_4:rhcos" ] } ], "title": "bind: Heap use-after-free vulnerability in BIND 9 DNS-over-HTTPS implementation" } ] }