{"id":"USN-8115-1","summary":"pyopenssl vulnerabilities","details":"It was discovered that pyOpenSSL incorrectly handled exceptions in the\ntlsext_servername callback. This could result in connections being\naccepted after an exception, contrary to expectations. (CVE-2026-27448)\n\nIt was discovered that pyOpenSSL incorrectly handled the DTLS cookie\ngeneration callback. If a callback provided cookie values greater than 256\nbytes, an attacker could use this issue to cause pyOpenSSL to crash,\nresulting in a denial of service, or possibly execute arbitrary code. This\nissue only affected Ubuntu 24.04 LTS and Ubuntu 25.10. (CVE-2026-27459)","modified":"2026-03-25T18:24:14.717170Z","published":"2026-03-23T13:08:05Z","related":["UBUNTU-CVE-2026-27448","UBUNTU-CVE-2026-27459"],"upstream":["CVE-2026-27448","CVE-2026-27459","UBUNTU-CVE-2026-27448","UBUNTU-CVE-2026-27459"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8115-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-27448"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-27459"}],"affected":[{"package":{"name":"pyopenssl","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/pyopenssl@21.0.0-1ubuntu0.1?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"21.0.0-1ubuntu0.1"}]}],"versions":["20.0.1-1","21.0.0-1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"python3-openssl","binary_version":"21.0.0-1ubuntu0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8115-1.json","cves_map":{"ecosystem":"Ubuntu:22.04:LTS","cves":[{"severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"},{"type":"Ubuntu","score":"low"}],"id":"CVE-2026-27448"}]}}},{"package":{"name":"pyopenssl","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/pyopenssl@23.2.0-1ubuntu0.1?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"23.2.0-1ubuntu0.1"}]}],"versions":["23.0.0-1","23.2.0-1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"python3-openssl","binary_version":"23.2.0-1ubuntu0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8115-1.json","cves_map":{"ecosystem":"Ubuntu:24.04:LTS","cves":[{"severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"},{"type":"Ubuntu","score":"low"}],"id":"CVE-2026-27448"},{"severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-27459"}]}}},{"package":{"name":"pyopenssl","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/pyopenssl@25.0.0-1ubuntu0.1?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"25.0.0-1ubuntu0.1"}]}],"versions":["25.0.0-1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"python3-openssl","binary_version":"25.0.0-1ubuntu0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8115-1.json","cves_map":{"ecosystem":"Ubuntu:25.10","cves":[{"severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"},{"type":"Ubuntu","score":"low"}],"id":"CVE-2026-27448"},{"severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-27459"}]}}}],"schema_version":"1.7.5"}