GHSA-g3xr-5w5j-w4q4

Source

https://github.com/advisories/GHSA-g3xr-5w5j-w4q4

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-g3xr-5w5j-w4q4/GHSA-g3xr-5w5j-w4q4.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-g3xr-5w5j-w4q4

Aliases

CVE-2026-50149

Published

2026-07-02T17:15:20Z

Modified

2026-07-02T17:30:11.986096756Z

Severity

6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N CVSS Calculator

Summary

Contour has Improper JWT Verification for Non-SNI Requests on Virtual Hosts with Fallback Certificate Enabled

Details

Impact

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.

To list all HTTPProxies with this invalid configuration, run

kubectl get httpproxies -A -o json | jq -r '
  .items[]
  | select(.spec.virtualhost | .tls.enableFallbackCertificate and .jwtProviders)
  | "Invalid HTTPProxy found: \(.metadata.namespace)/\(.metadata.name)"
'

Patches

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.

Workarounds

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.

References

Contour fallback certificate documentation: https://projectcontour.io/docs/main/config/tls-termination/#fallback-certificate
Contour JWT verification documentation: https://projectcontour.io/docs/main/config/jwt-verification/

Database specific

{
    "github_reviewed_at": "2026-07-02T17:15:20Z",
    "nvd_published_at": null,
    "github_reviewed": true,
    "cwe_ids": [
        "CWE-295"
    ],
    "severity": "MODERATE"
}

References

Affected packages

Go / github.com/projectcontour/contour

Package

Name: github.com/projectcontour/contour; View open source insights on deps.dev
Purl: pkg:golang/github.com/projectcontour/contour

Affected ranges

Type: SEMVER
Events: Introduced

1.23.0

Fixed

1.33.5

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-g3xr-5w5j-w4q4/GHSA-g3xr-5w5j-w4q4.json"