CVE-2026-50149

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{"affected": [{"affectedData": [{"product": "contour", "vendor": "projectcontour", "versions": [{"status": "affected", "version": ">= 1.23.0, < 1.33.5"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-50149", "lastModified": "2026-09-18T20:09:01.757", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 4.2, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-50149", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-25T02:03:02.855901Z", "version": "2.0.3"}}]}, "published": "2026-08-19T15:17:08.710", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/projectcontour/contour/security/advisories/GHSA-g3xr-5w5j-w4q4"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-295"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "contour: Contour: JWT verification bypass allows unauthorized access via HTTPProxy misconfiguration", "id": "2499692", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2499692"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N", "status": "draft"}, "cwe": "CWE-295", "details": ["A flaw was found in Contour. When an HTTPProxy is configured with both a fallback certificate and JWT (JSON Web Token) providers, Contour does not properly enforce JWT verification. This allows remote attackers to bypass security checks by sending requests without a valid token, specifically when clients do not provide a TLS Server Name Indication (SNI) or provide an unrecognized SNI. The consequence is unauthorized access to upstream services and potential information disclosure."], "mitigation": {"lang": "en:us", "value": "Upgrade to Contour v1.33.5 or later. As a workaround, do not enable enableFallbackCertificate on HTTPProxy resources that also define jwtProviders."}, "name": "CVE-2026-50149", "public_date": "2026-07-02T17:15:20Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-50149\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-50149\nhttps://github.com/projectcontour/contour/security/advisories/GHSA-g3xr-5w5j-w4q4"], "statement": "A flaw was found in Contour. When an HTTPProxy combines enableFallbackCertificate with jwtProviders, requests without TLS SNI bypass JWT verification and are proxied without a valid token.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": null}], "enrichment": {"confidence": 80.0, "confidence_source": "inferred", "scores": [{"score": 80.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "product": "contour", "vendor": "projectcontour"}], "created": "2026-07-15T14:15:15.708560+00:00", "updated": "2026-08-20T16:30:04.583464+00:00", "vendors": ["projectcontour", "projectcontour$PRODUCT$contour"]}