{"id":"DEBIAN-CVE-2026-27448","details":"pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 0.14.0 and prior to version 26.0.0, if a user provided callback to `set_tlsext_servername_callback` raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this callback for any security-sensitive behavior, this could allow bypassing it. Starting in version 26.0.0, unhandled exceptions now result in rejecting the connection.","modified":"2026-09-01T16:06:36.620745717Z","published":"2026-03-18T00:16:19.107Z","upstream":["CVE-2026-27448"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-27448"}],"affected":[{"package":{"name":"pyopenssl","ecosystem":"Debian:12","purl":"pkg:deb/debian/pyopenssl?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["23.0.0-1","23.2.0-1","24.0.0-1","24.0.0-2","24.0.0-3","24.0.0-4","24.0.0-5","24.1.0-1","24.2.1-1","24.3.0-1","25.0.0-1","25.1.0-1","25.1.0-2","25.3.0-1","25.3.0-2","26.0.0-1","26.1.0-1","26.2.0-1","26.2.0-1~exp1","26.3.0-1","26.3.0-1~exp1","26.4.0-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-27448.json"}},{"package":{"name":"pyopenssl","ecosystem":"Debian:13","purl":"pkg:deb/debian/pyopenssl?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"25.0.0-1+deb13u1"}]}],"versions":["25.0.0-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-27448.json"}},{"package":{"name":"pyopenssl","ecosystem":"Debian:14","purl":"pkg:deb/debian/pyopenssl?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"26.0.0-1"}]}],"versions":["25.0.0-1","25.1.0-1","25.1.0-2","25.3.0-1","25.3.0-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-27448.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"}]}