{"id":"CVE-2026-50149","title":"Contour is a Kubernetes ingress controller using Envoy proxy","summary":"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.v…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N","cwe":["CWE-295"],"vendor":"projectcontour","product":"github.com/projectcontour/contour","affected":["github.com/projectcontour/contour >= 1.23.0, < 1.33.5"],"patched":["github.com/projectcontour/contour 1.33.5"],"published":"2026-08-19","updated":"2026-09-18","sourceUpdated":"2026-09-18T20:09:01.757","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-50149","references":[{"url":"https://github.com/projectcontour/contour/security/advisories/GHSA-g3xr-5w5j-w4q4","label":"security-advisories@github.com"},{"url":"https://github.com/advisories/GHSA-g3xr-5w5j-w4q4"}],"tags":["nvd","ghsa","go"],"epss":0.00147,"epssPercentile":0.04325,"ecosystem":"go","ingestedAt":"2026-07-02T17:40:39.306Z","slug":"CVE-2026-50149","body":"## Overview\n\nContour 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-50149)\n\nAffected packages:\n\n- `github.com/projectcontour/contour >= 1.23.0, < 1.33.5`\n\nPatched in:\n\n- `github.com/projectcontour/contour 1.33.5`\n\nSource: https://github.com/advisories/GHSA-g3xr-5w5j-w4q4","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}