Vulnerabilities in pkg:golang/github.com/projectcontour/contour

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-g3xr-5w5j-w4q4",
  "modified" : "2026-07-02T17:15:20Z",
  "published" : "2026-07-02T17:15:20Z",
  "aliases" : [ "CVE-2026-50149" ],
  "summary" : "Contour has Improper JWT Verification for Non-SNI Requests on Virtual Hosts with Fallback Certificate Enabled",
  "details" : "### Impact\n\nWhen 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.\n\nTo list all `HTTPProxies` with this invalid configuration, run\n\n```bash\nkubectl get httpproxies -A -o json | jq -r '\n  .items[]\n  | select(.spec.virtualhost | .tls.enableFallbackCertificate and .jwtProviders)\n  | \"Invalid HTTPProxy found: \\(.metadata.namespace)/\\(.metadata.name)\"\n'\n```\n\n### Patches\n\nThis 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`.\n\n### Workarounds\n\nDo 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.\n\n### References\n\n- Contour fallback certificate documentation: https://projectcontour.io/docs/main/config/tls-termination/#fallback-certificate\n- Contour JWT verification documentation: https://projectcontour.io/docs/main/config/jwt-verification/",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/projectcontour/contour"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.23.0"
      }, {
        "fixed" : "1.33.5"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/projectcontour/contour/security/advisories/GHSA-g3xr-5w5j-w4q4"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/projectcontour/contour"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-295" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-02T17:15:20Z",
    "nvd_published_at" : null
  }
}