{ "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 postfix is now available for Red Hat Enterprise Linux 10.\n\nRed Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.", "title": "Topic" }, { "category": "general", "text": "The postfix packages provide a Mail Transport Agent (MTA), which supports protocols like LDAP, SMTP AUTH (SASL), and TLS.\n\nSecurity Fix(es):\n\n* postfix: buffer over-read via malformed enhanced status code (CVE-2026-43964)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed 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-2026:25930", "url": "https://access.redhat.com/errata/RHSA-2026:25930" }, { "category": "external", "summary": "https://access.redhat.com/security/updates/classification/#important", "url": "https://access.redhat.com/security/updates/classification/#important" }, { "category": "external", "summary": "2466488", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2466488" }, { "category": "self", "summary": "Canonical URL", "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_25930.json" } ], "title": "Red Hat Security Advisory: postfix security update", "tracking": { "current_release_date": "2026-08-20T02:13:37+00:00", "generator": { "date": "2026-08-20T02:13:37+00:00", "engine": { "name": "Red Hat SDEngine", "version": "5.3.16" } }, "id": "RHSA-2026:25930", "initial_release_date": "2026-06-15T10:07:51+00:00", "revision_history": [ { "date": "2026-06-15T10:07:51+00:00", "number": "1", "summary": "Initial version" }, { "date": "2026-06-15T10:07:51+00:00", "number": "2", "summary": "Last updated version" }, { "date": "2026-08-20T02:13:37+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. 10)", "product": { "name": "Red Hat Enterprise Linux AppStream (v. 10)", "product_id": 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This issue occurs when processing enhanced status codes, specifically an enhanced status code that lacks text following the third number. Depending on the configuration of the server, this allows a remote attacker to cause a buffer over-read of only 1 byte, leading to an application crash and resulting in a denial of service.", "title": "Vulnerability description" }, { "category": "summary", "text": "postfix: buffer over-read via malformed enhanced status code", "title": "Vulnerability summary" }, { "category": "other", "text": "This vulnerability cannot be triggered with an SMTP or LMTP server response. Instead, it is exposed only under specific server configurations:\n\n- Access tables\n- Policy server responses\n- Pipe-to-command output, header_checks, body_checks, an error transport in transport_maps or a milter response\n- DNSBL server TXT responses (specifically when Postfix is configured with \"$rbl_code $rbl_text\" in rbl_reply_maps or default_rbl_reply)\n\nAs this flaw allows a remote attacker to cause a denial of service, it has been rated with an important severity.", "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-10.2.Z:postfix-2:3.8.5-10.el10_2.aarch64", "AppStream-10.2.Z:postfix-2:3.8.5-10.el10_2.ppc64le", "AppStream-10.2.Z:postfix-2:3.8.5-10.el10_2.s390x", 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"category": "external", "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-43964", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43964" }, { "category": "external", "summary": "https://www.mail-archive.com/postfix-announce@postfix.org/msg00110.html", "url": "https://www.mail-archive.com/postfix-announce@postfix.org/msg00110.html" } ], "release_date": "2026-05-04T18:10:10.509000+00:00", "remediations": [ { "category": "vendor_fix", "date": "2026-06-15T10:07:51+00:00", "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258", "product_ids": [ "AppStream-10.2.Z:postfix-2:3.8.5-10.el10_2.aarch64", "AppStream-10.2.Z:postfix-2:3.8.5-10.el10_2.ppc64le", "AppStream-10.2.Z:postfix-2:3.8.5-10.el10_2.s390x", "AppStream-10.2.Z:postfix-2:3.8.5-10.el10_2.src", "AppStream-10.2.Z:postfix-2:3.8.5-10.el10_2.x86_64", "AppStream-10.2.Z:postfix-cdb-2:3.8.5-10.el10_2.aarch64", 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"AppStream-10.2.Z:postfix-sqlite-2:3.8.5-10.el10_2.s390x", "AppStream-10.2.Z:postfix-sqlite-2:3.8.5-10.el10_2.x86_64", "AppStream-10.2.Z:postfix-sqlite-debuginfo-2:3.8.5-10.el10_2.aarch64", "AppStream-10.2.Z:postfix-sqlite-debuginfo-2:3.8.5-10.el10_2.ppc64le", "AppStream-10.2.Z:postfix-sqlite-debuginfo-2:3.8.5-10.el10_2.s390x", "AppStream-10.2.Z:postfix-sqlite-debuginfo-2:3.8.5-10.el10_2.x86_64" ] } ], "threats": [ { "category": "impact", "details": "Important" } ], "title": "postfix: buffer over-read via malformed enhanced status code" } ] }