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CVE-2026-119559high8.2

OpenLiteSpeed through 1.9.4 mTLS Bypass via HTTP/3 SNI and Host Mismatch

Impact

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.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

litespeedtech · VulnCheck

openlitespeed

1 range
VulnCheck version evidence

Package identity

pkg:github/litespeedtech/openlitespeed

Identity supplied by VulnCheck. Version matching requires compatible range evidence.

Compare with this publisher’s ranges. This does not inspect your installation.

affected

0 → through 1.9.4

semver versions

unaffected

unknown

Other versions: unaffected

Original source 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.

Inside the record

Evidence available

Package identity
Version evidence
Remediation guidance · not supplied
Weakness classification
Additional publishers · not supplied

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-119559

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-295 ↗

Improper Certificate Validation

VulnCheck

Related →

Environment requirements

These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.

VulnCheck · platform conditions

Any condition may hold

Vulnerable product

cpe:2.3:a:litespeedtech:openlitespeed:*:*:*:*:*:*:*:*

Through (inclusive): 1.9.4

Original applicability statements
[
  {
    "nodes": [
      {
        "operator": "OR",
        "negate": false,
        "cpeMatch": [
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:a:litespeedtech:openlitespeed:*:*:*:*:*:*:*:*",
            "versionEndIncluding": "1.9.4"
          }
        ]
      }
    ]
  }
]
Contributing organizations · 1
VulnCheck

Assigning organization

2026-10-30

What changed

Follow changes
No substantive changes have been recorded here yet. History starts when cve.new observes a change after tracking is enabled; earlier edits are not reconstructed.

Large field values are marked as truncated previews. Original source snapshots remain retained.

References

6 sources
github.com/litespeedtech/openlitespeed/blob/v1.9.4/src/http/httpsession.cpp
technical-descriptionVulnCheck
github.com/litespeedtech/openlitespeed/blob/v1.9.4/src/sslpp/hiocrypto.h
technical-descriptionVulnCheck
github.com/litespeedtech/openlitespeed/blob/v1.9.4/src/quic/quicstream.h
technical-descriptionVulnCheck
abraxaslabs.tech/research/openlitespeed-h3-mtls-verifycontext
third-party-advisoryVulnCheck
github.com/litespeedtech/openlitespeed
productVulnCheck
www.vulncheck.com/advisories/openlitespeed-through-1.9.4-mtls-bypass-via-http-3-sni-and-host-mismatch
third-party-advisoryVulnCheck