Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate 2026-07-02T17:15:20 contour: Contour: JWT verification bypass allows unauthorized access via HTTPProxy misconfiguration 6.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N CWE-295

Contour is a Kubernetes ingress controller using Envoy proxy. In versions 1.23.0 through 1.33.4, when an `HTTPProxy` is configured with incompatible combination of both `.spec.virtualhost.tls.enableFallbackCertificate: true` and `.spec.virtualhost.jwtProviders`, Contour does not reject the configuration. Consequently, requests from clients that do not send TLS SNI or send an unrecognized SNI (one that does not match any `HTTPProxy` FQDN) bypass configured JWT verification and are proxied to upstream services without a valid token. This issue is fixed in Contour v1.33.5. Contour now rejects and marks invalid any `HTTPProxy` resources that combine `.spec.virtualhost.tls.enableFallbackCertificate: true` with `.spec.virtualhost.jwtProviders`. Affected resources will receive a status condition with the error reason `TLSIncompatibleFeatures`. As a workaround, do not enable `.spec.virtualhost.tls.enableFallbackCertificate` on `HTTPProxy` resources that also define `.spec.virtualhost.jwtProviders`. Remove one of the two settings to avoid the invalid configuration.

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.

A flaw was found in Contour. When an HTTPProxy combines enableFallbackCertificate with jwtProviders, requests without TLS SNI bypass JWT verification and are proxied without a valid token. Upgrade to Contour v1.33.5 or later. As a workaround, do not enable enableFallbackCertificate on HTTPProxy resources that also define jwtProviders. https://www.cve.org/CVERecord?id=CVE-2026-50149 https://nvd.nist.gov/vuln/detail/CVE-2026-50149 https://github.com/projectcontour/contour/security/advisories/GHSA-g3xr-5w5j-w4q4