Medium severity5.9NVD Advisory· Published Oct 30, 2026
CVE-2026-119559
CVE-2026-119559
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.
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Affected products
1- Range: <=1.9.4
Patches
Vulnerability mechanics
References
5- abraxaslabs.tech/research/openlitespeed-h3-mtls-verifycontextnvd
- github.com/litespeedtech/openlitespeed/blob/v1.9.4/src/http/httpsession.cppnvd
- github.com/litespeedtech/openlitespeed/blob/v1.9.4/src/quic/quicstream.hnvd
- github.com/litespeedtech/openlitespeed/blob/v1.9.4/src/sslpp/hiocrypto.hnvd
- www.vulncheck.com/advisories/openlitespeed-through-1.9.4-mtls-bypass-via-http-3-sni-and-host-mismatchnvd
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