{"id":"CVE-2026-119559","published":"2026-10-30T12:16:43.210","lastModified":"2026-10-30T19:23:25.493","description":"OpenLiteSpeed through 1.9.4 contains an authentication bypass vulnerability that allows unauthenticated remote attackers to evade virtual host client certificate requirements over HTTP/3. Because QuicStream inherits a verifyContext() implementation that always returns true, attackers can present a non-mTLS host's SNI with a protected Host header to access protected content.","cvssScore":5.9,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","cwes":["CWE-295"],"vendors":[],"products":[],"references":[{"url":"https://abraxaslabs.tech/research/openlitespeed-h3-mtls-verifycontext","tags":[]},{"url":"https://github.com/litespeedtech/openlitespeed","tags":[]},{"url":"https://github.com/litespeedtech/openlitespeed/blob/v1.9.4/src/http/httpsession.cpp#L1665-L1672","tags":[]},{"url":"https://github.com/litespeedtech/openlitespeed/blob/v1.9.4/src/quic/quicstream.h#L33-L37","tags":[]},{"url":"https://github.com/litespeedtech/openlitespeed/blob/v1.9.4/src/sslpp/hiocrypto.h#L49-L50","tags":[]},{"url":"https://www.vulncheck.com/advisories/openlitespeed-through-1.9.4-mtls-bypass-via-http-3-sni-and-host-mismatch","tags":[]}],"exploitRefs":[{"url":"https://github.com/litespeedtech/openlitespeed","tags":[]},{"url":"https://github.com/litespeedtech/openlitespeed/blob/v1.9.4/src/http/httpsession.cpp#L1665-L1672","tags":[]},{"url":"https://github.com/litespeedtech/openlitespeed/blob/v1.9.4/src/quic/quicstream.h#L33-L37","tags":[]},{"url":"https://github.com/litespeedtech/openlitespeed/blob/v1.9.4/src/sslpp/hiocrypto.h#L49-L50","tags":[]}],"hasPoc":true,"ai":null}