Red Hat Security Advisory: RHUI 4.11.4 security update - python-pyOpenSSL

Fixed packages 2

Vulnerabilities 1

• High 7.2
  CVE-2026-27459

  pyOpenSSL DTLS cookie callback buffer overflow

  pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 22.0.0 and prior to version 26.0.0, if a user provided callback to `set_cookie_generate_callback` returned a cookie value greater than 256 bytes, pyOpenSSL would overflow an OpenSSL…

  pyca pyopenssl airflow-3 py3-cassandra-medusa Debian Ubuntu Azure Linux Alpine Wolfi PyPI
  Mar 17, 2026

References

• article
  https://access.redhat.com/security/updates/classification/#important
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2448503
• advisory
  https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_10754.json
• report
  https://access.redhat.com/security/cve/CVE-2026-27459
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-27459
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-27459
• article
  https://github.com/pyca/pyopenssl/blob/358cbf29c4e364c59930e53a270116249581eaa3/CHANGELOG.rst
• article
  https://github.com/pyca/pyopenssl/commit/57f09bb4bb051d3bc2a1abd36e9525313d5cd408
• article
  https://github.com/pyca/pyopenssl/security/advisories/GHSA-5pwr-322w-8jr4