{"id":"BIT-contour-2026-50149","summary":"Contour has Improper JWT Verification for Non-SNI Requests on Virtual Hosts with Fallback Certificate Enabled","details":"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.","aliases":["CVE-2026-50149","GHSA-g3xr-5w5j-w4q4","GO-2026-5889"],"modified":"2026-08-25T23:48:55.172376066Z","published":"2026-08-25T08:38:13.920Z","database_specific":{"severity":"Medium","cpes":["cpe:2.3:a:projectcontour:contour:*:*:*:*:*:kubernetes:*:*"]},"references":[{"type":"WEB","url":"https://github.com/projectcontour/contour/security/advisories/GHSA-g3xr-5w5j-w4q4"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50149"}],"affected":[{"package":{"name":"contour","ecosystem":"Bitnami","purl":"pkg:bitnami/contour"},"ranges":[{"type":"SEMVER","events":[{"introduced":"1.23.0"},{"fixed":"1.33.5"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/contour/BIT-contour-2026-50149.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N"}]}],"schema_version":"1.9.0"}