{"id":"CVE-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":["BIT-contour-2026-50149","GHSA-g3xr-5w5j-w4q4","GO-2026-5889"],"modified":"2026-08-27T11:31:13.318716108Z","published":"2026-08-19T14:16:21.476Z","related":["CGA-5q9r-44pm-g2q2","openSUSE-SU-2026:21483-1"],"database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-295"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50149.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50149.json"},{"type":"ADVISORY","url":"https://github.com/projectcontour/contour/security/advisories/GHSA-g3xr-5w5j-w4q4"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50149"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/projectcontour/contour","events":[{"introduced":"4520248139257c38e0e12498c2aedbf811b69950"},{"fixed":"2713ad0e0ebd5d192a53803cef4c1c3a69692b1c"}],"database_specific":{"extracted_events":[{"introduced":"1.23.0"},{"fixed":"1.33.5"},{"fixed":"1.33.4"}],"source":["AFFECTED_FIELD","DESCRIPTION"]}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-50149.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N"}]}