{"schema_version":"1.7.5","id":"PYSEC-2026-2269","published":"2026-03-18T00:16:19.273Z","modified":"2026-07-13T07:15:42.174035827Z","aliases":["CVE-2026-27459","GHSA-5pwr-322w-8jr4"],"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.","affected":[{"package":{"name":"pyopenssl","ecosystem":"PyPI","purl":"pkg:pypi/pyopenssl"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"22.0.0"},{"fixed":"26.0.0"}]}],"versions":["22.0.0","22.1.0","23.0.0","23.1.0","23.1.1","23.2.0","23.3.0","24.0.0","24.1.0","24.2.1","24.3.0","25.0.0","25.1.0","25.2.0","25.3.0"],"ecosystem_specific":{},"database_specific":{"source":"https://github.com/pypa/advisory-database/blob/main/vulns/pyopenssl/PYSEC-2026-2269.yaml"}}],"references":[{"type":"WEB","url":"https://access.redhat.com/security/cve/CVE-2026-27459"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27459.json"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:10754"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:11856"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:11916"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:11996"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:13508"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:13512"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:13545"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:13553"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:14835"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:14873"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:14874"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:19375"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:21017"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:22465"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:24853"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:7224"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:8437"},{"type":"ADVISORY","url":"https://github.com/pyca/pyopenssl/blob/358cbf29c4e364c59930e53a270116249581eaa3/CHANGELOG.rst"},{"type":"ADVISORY","url":"https://github.com/pyca/pyopenssl/security/advisories/GHSA-5pwr-322w-8jr4"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2448503"},{"type":"FIX","url":"https://github.com/pyca/pyopenssl/commit/57f09bb4bb051d3bc2a1abd36e9525313d5cd408"}],"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}