Description
A flaw was found in Contour. When an HTTPProxy is configured with both a fallback certificate and JWT (JSON Web Token) providers, Contour does not properly enforce JWT verification. This allows remote attackers to bypass security checks by sending requests without a valid token, specifically when clients do not provide a TLS Server Name Indication (SNI) or provide an unrecognized SNI. The consequence is unauthorized access to upstream services and potential information disclosure.
Analysis
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Remediation
No vendor fix or workaround currently provided.
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Tracking
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Advisories
| Source | ID | Title |
|---|---|---|
 Github GHSA |
GHSA-g3xr-5w5j-w4q4 | Contour has Improper JWT Verification for Non-SNI Requests on Virtual Hosts with Fallback Certificate Enabled |
References
History
Wed, 15 Jul 2026 00:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | A flaw was found in Contour. When an HTTPProxy is configured with both a fallback certificate and JWT (JSON Web Token) providers, Contour does not properly enforce JWT verification. This allows remote attackers to bypass security checks by sending requests without a valid token, specifically when clients do not provide a TLS Server Name Indication (SNI) or provide an unrecognized SNI. The consequence is unauthorized access to upstream services and potential information disclosure. | |
| Title | contour: Contour: JWT verification bypass allows unauthorized access via HTTPProxy misconfiguration | |
| Weaknesses | CWE-295 | |
| References |
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| Metrics |
threat_severity
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cvssV3_1
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Subscriptions
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MITRE
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Redhat
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Weaknesses