A vulnerability (CVE-2025-69534, CVSS 7.5 HIGH) in python-markdown allows for a denial of service attack via the processing of malformed HTML-like sequences. The NVD data indicates python-markdown version 3.8 is affected, though the article does not specify a fixed version number. The update is rated Important and applies to Red Hat Enterprise Linux 9.6 Extended Update Support and related variants.
Red Hat Product Errata RHSA-2026:20676 - Security Advisory Issued: 2026-05-26 Updated: 2026-05-26 RHSA-2026:20676 - Security Advisory Overview Updated Packages Synopsis Important: python-markdown security update Type/Severity Security Advisory: Important Red Hat Lightspeed patch analysis Identify and remediate systems affected by this advisory. View affected systems Topic An update for python-markdown is now available for Red Hat Enterprise Linux 9.6 Extended Update Support. Red 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. Description Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems. Security Fix(es): python-markdown: denial of service via malformed HTML-like sequences (CVE-2025-69534) For 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. Solution For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Affected Products Red Hat Enterprise Linux for x86_64 - Extended Update Support 9.6 x86_64 Red Hat Enterprise Linux Server - AUS 9.6 x86_64 Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 9.6 s390x Red Hat Enterprise Linux for Power, little endian - Extended Update Support 9.6 ppc64le Red Hat Enterprise Linux for ARM 64 - Extended Update Support 9.6 aarch64 Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 9.6 ppc64le Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.6 x86_64 Red Hat Enterprise Linux for ARM 64 - 4 years of updates 9.6 aarch64 Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 9.6 s390x Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 9.6 x86_64 Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle 9.6 aarch64 Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 9.6 ppc64le Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle 9.6 s390x Fixes BZ - 2444839 - CVE-2025-69534 python-markdown: denial of service via malformed HTML-like sequences CVEs CVE-2025-69534 References https://access.redhat.com/security/updates/classification/#important Note: More recent versions of these packages may be available. 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Red Hat Enterprise Linux for x86_64 - Extended Update Support 9.6 SRPM python-markdown-3.3.4-4.el9_6.2.src.rpm SHA-256: ee064a1093f563d62d10d9a71f33c2b94a8a261ade83d592fed09a25c6119aaa x86_64 python3-markdown-3.3.4-4.el9_6.2.noarch.rpm SHA-256: 2702402d2c38a9e65b71a3fc320dd321aa610b9a48bfb077a9c719e723e1e408 Red Hat Enterprise Linux Server - AUS 9.6 SRPM python-markdown-3.3.4-4.el9_6.2.src.rpm SHA-256: ee064a1093f563d62d10d9a71f33c2b94a8a261ade83d592fed09a25c6119aaa x86_64 python3-markdown-3.3.4-4.el9_6.2.noarch.rpm SHA-256: 2702402d2c38a9e65b71a3fc320dd321aa610b9a48bfb077a9c719e723e1e408 Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 9.6 SRPM python-markdown-3.3.4-4.el9_6.2.src.rpm SHA-256: ee064a1093f563d62d10d9a71f33c2b94a8a261ade83d592fed09a25c6119aaa s390x python3-markdown-3.3.4-4.el9_6.2.noarch.rpm SHA-256: 2702402d2c38a9e65b71a3fc320dd321aa610b9a48bfb077a9c719e723e1e408 Red Hat Enterprise Linux for Power, little endian - Extended Update Support 9.6 SRPM python-markdown-3.3.4-4.el9_6.2.src.rpm SHA-256: ee064a1093f563d62d10d9a71f33c2b94a8a261ade83d592fed09a25c6119aaa ppc64le python3-markdown-3.3.4-4.el9_6.2.noarch.rpm SHA-256: 2702402d2c38a9e65b71a3fc320dd321aa610b9a48bfb077a9c719e723e1e408 Red Hat Enterprise Linux for ARM 64 - Extended Update Support 9.6 SRPM python-markdown-3.3.4-4.el9_6.2.src.rpm SHA-256: ee064a1093f563d62d10d9a71f33c2b94a8a261ade83d592fed09a25c6119aaa aarch64 python3-markdown-3.3.4-4.el9_6.2.noarch.rpm SHA-256: 2702402d2c38a9e65b71a3fc320dd321aa610b9a48bfb077a9c719e723e1e408 Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 9.6 SRPM python-markdown-3.3.4-4.el9_6.2.src.rpm SHA-256: ee064a1093f563d62d10d9a71f33c2b94a8a261ade83d592fed09a25c6119aaa ppc64le python3-markdown-3.3.4-4.el9_6.2.noarch.rpm SHA-256: 2702402d2c38a9e65b71a3fc320dd321aa610b9a48bfb077a9c719e723e1e408 Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.6 SRPM python-markdown-3.3.4-4.el9_6.2.src.rpm SHA-256: ee064a1093f563d62d10d9a71f33c2b94a8a261ade83d592fed09a25c6119aaa x86_64 python3-markdown-3.3.4-4.el9_6.2.noarch.rpm SHA-256: 2702402d2c38a9e65b71a3fc320dd321aa610b9a48bfb077a9c719e723e1e408 Red Hat Enterprise Linux for ARM 64 - 4 years of updates 9.6 SRPM python-markdown-3.3.4-4.el9_6.2.src.rpm SHA-256: ee064a1093f563d62d10d9a71f33c2b94a8a261ade83d592fed09a25c6119aaa aarch64 python3-markdown-3.3.4-4.el9_6.2.noarch.rpm SHA-256: 2702402d2c38a9e65b71a3fc320dd321aa610b9a48bfb077a9c719e723e1e408 Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 9.6 SRPM python-markdown-3.3.4-4.el9_6.2.src.rpm SHA-256: ee064a1093f563d62d10d9a71f33c2b94a8a261ade83d592fed09a25c6119aaa s390x python3-markdown-3.3.4-4.el9_6.2.noarch.rpm SHA-256: 2702402d2c38a9e65b71a3fc320dd321aa610b9a48bfb077a9c719e723e1e408 Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 9.6 SRPM python-markdown-3.3.4-4.el9_6.2.src.rpm SHA-256: ee064a1093f563d62d10d9a71f33c2b94a8a261ade83d592fed09a25c6119aaa x86_64 python3-markdown-3.3.4-4.el9_6.2.noarch.rpm SHA-256: 2702402d2c38a9e65b71a3fc320dd321aa610b9a48bfb077a9c719e723e1e408 Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle 9.6 SRPM python-markdown-3.3.4-4.el9_6.2.src.rpm SHA-256: ee064a1093f563d62d10d9a71f33c2b94a8a261ade83d592fed09a25c6119aaa aarch64 python3-markdown-3.3.4-4.el9_6.2.noarch.rpm SHA-256: 2702402d2c38a9e65b71a3fc320dd321aa610b9a48bfb077a9c719e723e1e408 Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 9.6 SRPM python-markdown-3.3.4-4.el9_6.2.src.rpm SHA-256: ee064a1093f563d62d10d9a71f33c2b94a8a261ade83d592fed09a25c6119aaa ppc64le python3-markdown-3.3.4-4.el9_6.2.noarch.rpm SHA-256: 2702402d2c38a9e65b71a3fc320dd321aa610b9a48bfb077a9c719e723e1e408 Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle 9.6 SRPM python-markdown-3.3.4-4.el9_6.2.src.rpm SHA-256: ee064a1093f563d62d10d9a71f33c2b94a8a261ade83d592fed09a25c6119aaa s390x python3-markdown-3.3.4-4.el9_6.2.noarch.rpm SHA-256: 2702402d2c38a9e65b71a3fc320dd321aa610b9a48bfb077a9c719e723e1e408 The Red Hat security contact is secalert@redhat.com . More contact details at https://access.redhat.com/security/team/contact/ .