{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-119559","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","state":"PUBLISHED","assignerShortName":"VulnCheck","dateReserved":"2026-10-30T10:53:29.316Z","datePublished":"2026-10-30T11:31:08.276Z","dateUpdated":"2026-10-30T11:31:08.276Z"},"containers":{"cna":{"providerMetadata":{"orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","shortName":"VulnCheck","dateUpdated":"2026-10-30T11:31:08.276Z"},"datePublic":"2026-10-12T00:00:00.000Z","title":"OpenLiteSpeed through 1.9.4 mTLS Bypass via HTTP/3 SNI and Host Mismatch","descriptions":[{"lang":"en","value":"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."}],"problemTypes":[{"descriptions":[{"lang":"en","description":"Improper Certificate Validation","cweId":"CWE-295","type":"CWE"}]}],"affected":[{"vendor":"litespeedtech","product":"openlitespeed","defaultStatus":"unaffected","versions":[{"version":"0","lessThanOrEqual":"1.9.4","status":"affected","versionType":"semver"}],"packageURL":"pkg:github/litespeedtech/openlitespeed","repo":"https://github.com/litespeedtech/openlitespeed"}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:litespeedtech:openlitespeed:*:*:*:*:*:*:*:*","versionEndIncluding":"1.9.4"}]}]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","attackVector":"NETWORK","attackComplexity":"HIGH","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":8.2,"baseSeverity":"HIGH"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE","baseScore":5.9,"baseSeverity":"MEDIUM"}}],"references":[{"url":"https://github.com/litespeedtech/openlitespeed/blob/v1.9.4/src/http/httpsession.cpp#L1665-L1672","tags":["technical-description"]},{"url":"https://github.com/litespeedtech/openlitespeed/blob/v1.9.4/src/sslpp/hiocrypto.h#L49-L50","tags":["technical-description"]},{"url":"https://github.com/litespeedtech/openlitespeed/blob/v1.9.4/src/quic/quicstream.h#L33-L37","tags":["technical-description"]},{"url":"https://abraxaslabs.tech/research/openlitespeed-h3-mtls-verifycontext","tags":["third-party-advisory"]},{"url":"https://github.com/litespeedtech/openlitespeed","tags":["product"]},{"name":"VulnCheck Advisory: OpenLiteSpeed through 1.9.4 mTLS Bypass via HTTP/3 SNI and Host Mismatch","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/openlitespeed-through-1.9.4-mtls-bypass-via-http-3-sni-and-host-mismatch"}],"credits":[{"lang":"en","value":"Abraxas Labs","type":"finder"}],"x_generator":{"engine":"vulncheck-endgame"}}}}