RHSA-2026:74087HighCVSS 7.5

Red Hat Security Advisory: python3.9 security update

Published
September 30, 2026
Last Modified
October 1, 2026

🔗 CVE IDs covered (4)

CVE-2025-6069 →CVE-2025-6075 →CVE-2026-11940 →CVE-2026-15308 →

📋 Description

CVE-2025-6069 — cpython: Python HTMLParser quadratic complexity CVE-2025-6075 — python: Quadratic complexity in os.path.expandvars() with user-controlled template CVE-2026-11940 — python: cpython: CPython: tarfile extraction filter bypass allows escaping the destination directory CVE-2026-15308 — python: Python: CPU Denial of Service in HTML parser via repeated unterminated markup declarations

🎯 Affected products42

  • Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • Red Hat Enterprise Linux BaseOS E4S (v.9.4)
  • python-unversioned-command-0:3.9.18-3.el9_4.14.noarch as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • python3-0:3.9.18-3.el9_4.14.aarch64 as a component of Red Hat Enterprise Linux BaseOS E4S (v.9.4)
  • python3-0:3.9.18-3.el9_4.14.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v.9.4)
  • python3-0:3.9.18-3.el9_4.14.s390x as a component of Red Hat Enterprise Linux BaseOS E4S (v.9.4)
  • python3-0:3.9.18-3.el9_4.14.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v.9.4)
  • python3-devel-0:3.9.18-3.el9_4.14.aarch64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • python3-devel-0:3.9.18-3.el9_4.14.i686 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • python3-devel-0:3.9.18-3.el9_4.14.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • python3-devel-0:3.9.18-3.el9_4.14.s390x as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • python3-devel-0:3.9.18-3.el9_4.14.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • python3-libs-0:3.9.18-3.el9_4.14.aarch64 as a component of Red Hat Enterprise Linux BaseOS E4S (v.9.4)
  • python3-libs-0:3.9.18-3.el9_4.14.i686 as a component of Red Hat Enterprise Linux BaseOS E4S (v.9.4)
  • python3-libs-0:3.9.18-3.el9_4.14.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v.9.4)
  • python3-libs-0:3.9.18-3.el9_4.14.s390x as a component of Red Hat Enterprise Linux BaseOS E4S (v.9.4)
  • python3-libs-0:3.9.18-3.el9_4.14.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v.9.4)
  • python3-tkinter-0:3.9.18-3.el9_4.14.aarch64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • python3-tkinter-0:3.9.18-3.el9_4.14.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • python3-tkinter-0:3.9.18-3.el9_4.14.s390x as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • python3-tkinter-0:3.9.18-3.el9_4.14.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • python3.9-0:3.9.18-3.el9_4.14.src as a component of Red Hat Enterprise Linux BaseOS E4S (v.9.4)
  • python3.9-debuginfo-0:3.9.18-3.el9_4.14.aarch64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • python3.9-debuginfo-0:3.9.18-3.el9_4.14.aarch64 as a component of Red Hat Enterprise Linux BaseOS E4S (v.9.4)
  • python3.9-debuginfo-0:3.9.18-3.el9_4.14.i686 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • python3.9-debuginfo-0:3.9.18-3.el9_4.14.i686 as a component of Red Hat Enterprise Linux BaseOS E4S (v.9.4)
  • python3.9-debuginfo-0:3.9.18-3.el9_4.14.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • python3.9-debuginfo-0:3.9.18-3.el9_4.14.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v.9.4)
  • python3.9-debuginfo-0:3.9.18-3.el9_4.14.s390x as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • python3.9-debuginfo-0:3.9.18-3.el9_4.14.s390x as a component of Red Hat Enterprise Linux BaseOS E4S (v.9.4)
  • +12 more not shown

✅ Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Workaround: 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. Workaround: No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability. Workaround: 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.

🔗 References (7)