{"id":"USN-8335-1","summary":"pyopenssl vulnerability","details":"It was discovered that pyOpenSSL incorrectly handled exceptions in the\ntlsext_servername callback. This could result in connections being accepted\nafter an exception, contrary to expectations.","modified":"2026-05-28T16:02:42.339860029Z","published":"2026-05-28T12:47:22Z","related":["UBUNTU-CVE-2026-27448"],"upstream":["CVE-2026-27448","UBUNTU-CVE-2026-27448"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8335-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-27448"}],"affected":[{"package":{"name":"pyopenssl","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/pyopenssl?arch=source&distro=esm-infra-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.15.1-2ubuntu0.2+esm1"}]}],"versions":["0.15.1-2build1","0.15.1-2ubuntu0.2"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro","binaries":[{"binary_version":"0.15.1-2ubuntu0.2+esm1","binary_name":"python-openssl"},{"binary_version":"0.15.1-2ubuntu0.2+esm1","binary_name":"python3-openssl"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:16.04:LTS","cves":[{"id":"CVE-2026-27448","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"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8335-1.json"}},{"package":{"name":"pyopenssl","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/pyopenssl?arch=source&distro=esm-infra%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"17.5.0-1ubuntu1+esm1"}]}],"versions":["16.2.0-1","17.5.0-1","17.5.0-1ubuntu1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_version":"17.5.0-1ubuntu1+esm1","binary_name":"python-openssl"},{"binary_version":"17.5.0-1ubuntu1+esm1","binary_name":"python3-openssl"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:18.04:LTS","cves":[{"id":"CVE-2026-27448","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"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8335-1.json"}},{"package":{"name":"pyopenssl","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/pyopenssl?arch=source&distro=esm-infra%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"19.0.0-1ubuntu0.1~esm1"}]}],"versions":["19.0.0-1","19.0.0-1build1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_version":"19.0.0-1ubuntu0.1~esm1","binary_name":"python-openssl"},{"binary_version":"19.0.0-1ubuntu0.1~esm1","binary_name":"python3-openssl"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:20.04:LTS","cves":[{"id":"CVE-2026-27448","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"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8335-1.json"}}],"schema_version":"1.7.5"}