{"id":"CVE-2026-119559","aliases":[],"cve":{"records":[{"id":"CVE-2026-119559","source":"VulnCheck","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-10-30T10:53:29.316Z","published":"2026-10-30T11:31:08.276Z","modified":"2026-10-30T11:31:08.276Z"}],"publishers":[{"name":"VulnCheck","role":"CNA","organizationId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","modified":"2026-10-30T11:31:08.276Z"}],"references":[{"url":"https://github.com/litespeedtech/openlitespeed/blob/v1.9.4/src/http/httpsession.cpp#L1665-L1672","tags":["technical-description"],"source":"VulnCheck"},{"url":"https://github.com/litespeedtech/openlitespeed/blob/v1.9.4/src/sslpp/hiocrypto.h#L49-L50","tags":["technical-description"],"source":"VulnCheck"},{"url":"https://github.com/litespeedtech/openlitespeed/blob/v1.9.4/src/quic/quicstream.h#L33-L37","tags":["technical-description"],"source":"VulnCheck"},{"url":"https://abraxaslabs.tech/research/openlitespeed-h3-mtls-verifycontext","tags":["third-party-advisory"],"source":"VulnCheck"},{"url":"https://github.com/litespeedtech/openlitespeed","tags":["product"],"source":"VulnCheck"},{"url":"https://www.vulncheck.com/advisories/openlitespeed-through-1.9.4-mtls-bypass-via-http-3-sni-and-host-mismatch","tags":["third-party-advisory"],"source":"VulnCheck"}],"weaknesses":[{"id":"CWE-295","description":"Improper Certificate Validation","source":"VulnCheck"}],"applicability":[{"source":"VulnCheck","statements":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:litespeedtech:openlitespeed:*:*:*:*:*:*:*:*","versionEndIncluding":"1.9.4"}]}]}]}],"prioritization":[]},"title":"OpenLiteSpeed through 1.9.4 mTLS Bypass via HTTP/3 SNI and Host Mismatch","titleSource":"VulnCheck","descriptionSource":"VulnCheck","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content.","score":8.2,"severity":"high","published":"2026-10-30T11:31:08.276Z","modified":"2026-10-30T11:31:08.276Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"litespeedtech","name":"openlitespeed","platforms":[],"versions":[{"version":"0","status":"affected","lessThanOrEqual":"1.9.4","versionType":"semver"}],"defaultStatus":"unaffected","packageURL":"pkg:github/litespeedtech/openlitespeed","cpes":[],"source":"VulnCheck","url":"https://www.cve.org/CVERecord?id=CVE-2026-119559"}],"remediation":[],"references":["https://github.com/litespeedtech/openlitespeed/blob/v1.9.4/src/http/httpsession.cpp#L1665-L1672","https://github.com/litespeedtech/openlitespeed/blob/v1.9.4/src/sslpp/hiocrypto.h#L49-L50","https://github.com/litespeedtech/openlitespeed/blob/v1.9.4/src/quic/quicstream.h#L33-L37","https://abraxaslabs.tech/research/openlitespeed-h3-mtls-verifycontext","https://github.com/litespeedtech/openlitespeed","https://www.vulncheck.com/advisories/openlitespeed-through-1.9.4-mtls-bypass-via-http-3-sni-and-host-mismatch"],"sources":[{"name":"CVE","id":"CVE-2026-119559","modified":"2026-10-30T11:31:08.276Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-119559"}],"assessments":[{"source":"VulnCheck","vector":"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","score":8.2},{"source":"VulnCheck","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","score":5.9}],"sourceAffected":[],"observedAt":"2026-10-30T11:36:55.203Z","kev":{"status":"not-listed","checkedAt":"2026-10-31T00:50:33.640Z"},"coverage":[{"source":"NVD","status":"no-result","checkedAt":"2026-10-30T12:15:35.069Z","attemptedAt":"2026-10-30T12:15:35.069Z"},{"source":"GHSA","status":"no-result","checkedAt":"2026-10-30T12:15:34.975Z","attemptedAt":"2026-10-30T12:15:34.975Z"},{"source":"EUVD","status":"available","checkedAt":"2026-10-30T12:15:34.975Z","attemptedAt":"2026-10-30T12:15:34.975Z"},{"source":"EPSS","status":"no-result","checkedAt":"2026-10-30T12:15:34.975Z","attemptedAt":"2026-10-30T12:15:34.975Z"}],"evidence":[{"source":"ENISA EUVD","id":"EUVD-2026-113824","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-113824","modified":"Oct 30, 2026, 11:31:08 AM","score":8.2,"vector":"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","checkedAt":"2026-10-30T12:15:34.975Z"}],"aiSummary":{"text":"OpenLiteSpeed through 1.9.4 has an authentication bypass vulnerability, allowing unauthenticated remote attackers to access protected content over HTTP/3 by presenting a non-mTLS host's SNI with a protected Host header. The QuicStream implementation always returns true, bypassing virtual host client certificate requirements. Attackers need access to the HTTP/3 connection.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-10-30T11:41:37.758Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-119559"}]}}