PYSEC-2026-2269

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PYSEC-2026-2269

Summary:

Details: 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 provided buffer. Starting in version 26.0.0, cookie values that are too long are now rejected.

References: https://access.redhat.com/security/cve/CVE-2026-27459, https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27459.json, https://access.redhat.com/errata/RHSA-2026:10754, https://access.redhat.com/errata/RHSA-2026:11856, https://access.redhat.com/errata/RHSA-2026:11916, https://access.redhat.com/errata/RHSA-2026:11996, https://access.redhat.com/errata/RHSA-2026:13508, https://access.redhat.com/errata/RHSA-2026:13512, https://access.redhat.com/errata/RHSA-2026:13545, https://access.redhat.com/errata/RHSA-2026:13553, https://access.redhat.com/errata/RHSA-2026:14835, https://access.redhat.com/errata/RHSA-2026:14873, https://access.redhat.com/errata/RHSA-2026:14874, https://access.redhat.com/errata/RHSA-2026:19375, https://access.redhat.com/errata/RHSA-2026:21017, https://access.redhat.com/errata/RHSA-2026:22465, https://access.redhat.com/errata/RHSA-2026:24853, https://access.redhat.com/errata/RHSA-2026:7224, https://access.redhat.com/errata/RHSA-2026:8437, https://github.com/pyca/pyopenssl/blob/358cbf29c4e364c59930e53a270116249581eaa3/CHANGELOG.rst, https://github.com/pyca/pyopenssl/security/advisories/GHSA-5pwr-322w-8jr4, https://bugzilla.redhat.com/show_bug.cgi?id=2448503, https://github.com/pyca/pyopenssl/commit/57f09bb4bb051d3bc2a1abd36e9525313d5cd408