Red Hat Product Errata RHSA-2026:19366 - Security Advisory Issued: 2026-05-19 Updated: 2026-05-19 RHSA-2026:19366 - 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. 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 9 x86_64 Red Hat Enterprise Linux for x86_64 - Extended Update Support 9.8 x86_64 Red Hat Enterprise Linux for IBM z Systems 9 s390x Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 9.8 s390x Red Hat Enterprise Linux for Power, little endian 9 ppc64le Red Hat Enterprise Linux for Power, little endian - Extended Update Support 9.8 ppc64le Red Hat Enterprise Linux for ARM 64 9 aarch64 Red Hat Enterprise Linux for ARM 64 - Extended Update Support 9.8 aarch64 Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 9.8 ppc64le Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.8 x86_64 Red Hat Enterprise Linux for ARM 64 - 4 years of updates 9.8 aarch64 Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 9.8 s390x Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 9.8 x86_64 Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle 9.8 aarch64 Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 9.8 ppc64le Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle 9.8 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. Click a package name for more details. Red Hat Enterprise Linux for x86_64 9 SRPM python-markdown-3.3.4-4.el9_8.2.src.rpm SHA-256: a6d70257e948900e8319a0b4589a957019e454d6810fab3ff70ba4157f939a5c x86_64 python3-markdown-3.3.4-4.el9_8.2.noarch.rpm SHA-256: a011306458dbb9ec3b503c11ee5df069a9f99de3d7ce090ebf5f3ff123c8efd5 Red Hat Enterprise Linux for x86_64 - Extended Update Support 9.8 SRPM python-markdown-3.3.4-4.el9_8.2.src.rpm SHA-256: a6d70257e948900e8319a0b4589a957019e454d6810fab3ff70ba4157f939a5c x86_64 python3-markdown-3.3.4-4.el9_8.2.noarch.rpm SHA-256: a011306458dbb9ec3b503c11ee5df069a9f99de3d7ce090ebf5f3ff123c8efd5 Red Hat Enterprise Linux for IBM z Systems 9 SRPM python-markdown-3.3.4-4.el9_8.2.src.rpm SHA-256: a6d70257e948900e8319a0b4589a957019e454d6810fab3ff70ba4157f939a5c s390x python3-markdown-3.3.4-4.el9_8.2.noarch.rpm SHA-256: a011306458dbb9ec3b503c11ee5df069a9f99de3d7ce090ebf5f3ff123c8efd5 Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 9.8 SRPM python-markdown-3.3.4-4.el9_8.2.src.rpm SHA-256: a6d70257e948900e8319a0b4589a957019e454d6810fab3ff70ba4157f939a5c s390x python3-markdown-3.3.4-4.el9_8.2.noarch.rpm SHA-256: a011306458dbb9ec3b503c11ee5df069a9f99de3d7ce090ebf5f3ff123c8efd5 Red Hat Enterprise Linux for Power, little endian 9 SRPM python-markdown-3.3.4-4.el9_8.2.src.rpm SHA-256: a6d70257e948900e8319a0b4589a957019e454d6810fab3ff70ba4157f939a5c ppc64le python3-markdown-3.3.4-4.el9_8.2.noarch.rpm SHA-256: a011306458dbb9ec3b503c11ee5df069a9f99de3d7ce090ebf5f3ff123c8efd5 Red Hat Enterprise Linux for Power, little endian - Extended Update Support 9.8 SRPM python-markdown-3.3.4-4.el9_8.2.src.rpm SHA-256: a6d70257e948900e8319a0b4589a957019e454d6810fab3ff70ba4157f939a5c ppc64le python3-markdown-3.3.4-4.el9_8.2.noarch.rpm SHA-256: a011306458dbb9ec3b503c11ee5df069a9f99de3d7ce090ebf5f3ff123c8efd5 Red Hat Enterprise Linux for ARM 64 9 SRPM python-markdown-3.3.4-4.el9_8.2.src.rpm SHA-256: a6d70257e948900e8319a0b4589a957019e454d6810fab3ff70ba4157f939a5c aarch64 python3-markdown-3.3.4-4.el9_8.2.noarch.rpm SHA-256: a011306458dbb9ec3b503c11ee5df069a9f99de3d7ce090ebf5f3ff123c8efd5 Red Hat Enterprise Linux for ARM 64 - Extended Update Support 9.8 SRPM python-markdown-3.3.4-4.el9_8.2.src.rpm SHA-256: a6d70257e948900e8319a0b4589a957019e454d6810fab3ff70ba4157f939a5c aarch64 python3-markdown-3.3.4-4.el9_8.2.noarch.rpm SHA-256: a011306458dbb9ec3b503c11ee5df069a9f99de3d7ce090ebf5f3ff123c8efd5 Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 9.8 SRPM python-markdown-3.3.4-4.el9_8.2.src.rpm SHA-256: a6d70257e948900e8319a0b4589a957019e454d6810fab3ff70ba4157f939a5c ppc64le python3-markdown-3.3.4-4.el9_8.2.noarch.rpm SHA-256: a011306458dbb9ec3b503c11ee5df069a9f99de3d7ce090ebf5f3ff123c8efd5 Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.8 SRPM python-markdown-3.3.4-4.el9_8.2.src.rpm SHA-256: a6d70257e948900e8319a0b4589a957019e454d6810fab3ff70ba4157f939a5c x86_64 python3-markdown-3.3.4-4.el9_8.2.noarch.rpm SHA-256: a011306458dbb9ec3b503c11ee5df069a9f99de3d7ce090ebf5f3ff123c8efd5 Red Hat Enterprise Linux for ARM 64 - 4 years of updates 9.8 SRPM python-markdown-3.3.4-4.el9_8.2.src.rpm SHA-256: a6d70257e948900e8319a0b4589a957019e454d6810fab3ff70ba4157f939a5c aarch64 python3-markdown-3.3.4-4.el9_8.2.noarch.rpm SHA-256: a011306458dbb9ec3b503c11ee5df069a9f99de3d7ce090ebf5f3ff123c8efd5 Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 9.8 SRPM python-markdown-3.3.4-4.el9_8.2.src.rpm SHA-256: a6d70257e948900e8319a0b4589a957019e454d6810fab3ff70ba4157f939a5c s390x python3-markdown-3.3.4-4.el9_8.2.noarch.rpm SHA-256: a011306458dbb9ec3b503c11ee5df069a9f99de3d7ce090ebf5f3ff123c8efd5 Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 9.8 SRPM python-markdown-3.3.4-4.el9_8.2.src.rpm SHA-256: a6d70257e948900e8319a0b4589a957019e454d6810fab3ff70ba4157f939a5c x86_64 python3-markdown-3.3.4-4.el9_8.2.noarch.rpm SHA-256: a011306458dbb9ec3b503c11ee5df069a9f99de3d7ce090ebf5f3ff123c8efd5 Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle 9.8 SRPM python-markdown-3.3.4-4.el9_8.2.src.rpm SHA-256: a6d70257e948900e8319a0b4589a957019e454d6810fab3ff70ba4157f939a5c aarch64 python3-markdown-3.3.4-4.el9_8.2.noarch.rpm SHA-256: a011306458dbb9ec3b503c11ee5df069a9f99de3d7ce090ebf5f3ff123c8efd5 Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 9.8 SRPM python-markdown-3.3.4-4.el9_8.2.src.rpm SHA-256: a6d70257e948900e8319a0b4589a957019e454d6810fab3ff70ba4157f939a5c ppc64le python3-markdown-3.3.4-4.el9_8.2.noarch.rpm SHA-256: a011306458dbb9ec3b503c11ee5df069a9f99de3d7ce090ebf5f3ff123c8efd5 Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle 9.8 SRPM python-markdown-3.3.4-4.el9_8.2.src.rpm SHA-256: a6d70257e948900e8319a0b4589a957019e454d6810fab3ff70ba4157f939a5c s390x python3-markdown-3.3.4-4.el9_8.2.noarch.rpm SHA-256: a011306458dbb9ec3b503c11ee5df069a9f99de3d7ce090ebf5f3ff123c8efd5 The Red Hat security contact is secalert@redhat.com . More contact details at https://access.redhat.com/security/team/contact/ .