{"action":"Upgrade pyopenssl to 26.0.0 or later.","affected":[{"fixed":"26.0.0","introduced":"22.0.0"}],"component":"pyopenssl","cve_ids":["CVE-2026-27459"],"ecosystem":"PyPI","epss":0.00731,"exploited":false,"fixed_versions":["26.0.0"],"ghsa_id":"GHSA-5pwr-322w-8jr4","id":"tcs_01M5KF1GV5ANMHFQZ71726TAF6","modified_at":"2026-09-10T03:50:37.586707545Z","published_at":"2026-03-16T16:22:29Z","references":["https://osv.dev/vulnerability/GHSA-5pwr-322w-8jr4","https://github.com/pyca/pyopenssl/security/advisories/GHSA-5pwr-322w-8jr4","https://nvd.nist.gov/vuln/detail/CVE-2026-27459","https://github.com/pyca/pyopenssl/commit/57f09bb4bb051d3bc2a1abd36e9525313d5cd408","https://github.com/pyca/pyopenssl","https://github.com/pyca/pyopenssl/blob/358cbf29c4e364c59930e53a270116249581eaa3/CHANGELOG.rst"],"severity":{"label":"critical","score":9.8},"sources":[{"source":"osv","source_id":"GHSA-5pwr-322w-8jr4","url":"https://osv.dev/vulnerability/GHSA-5pwr-322w-8jr4"},{"source":"nvd","source_id":"CVE-2026-27459","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27459"}],"summary":"pyOpenSSL DTLS cookie callback buffer overflow"}