{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-53622", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-06-09T20:16:59.646Z", "datePublished": "2026-06-23T19:13:28.844Z", "dateUpdated": "2026-06-25T12:44:19.114Z"}, "containers": {"cna": {"title": "Traefik: HTTP/3 mTLS bypass via exact SNI TLSOptions lookup for wildcard and mixed-case hosts", "problemTypes": [{"descriptions": [{"cweId": "CWE-288", "lang": "en", "description": "CWE-288: Authentication Bypass Using an Alternate Path or Channel", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "HIGH", "subAvailabilityImpact": "NONE", "baseScore": 7.8, "baseSeverity": "HIGH", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N", "version": "4.0"}}], "references": [{"name": "https://github.com/traefik/traefik/security/advisories/GHSA-9cr8-q42q-g8m7", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/traefik/traefik/security/advisories/GHSA-9cr8-q42q-g8m7"}, {"name": "https://github.com/traefik/traefik/releases/tag/v3.7.3", "tags": ["x_refsource_MISC"], "url": "https://github.com/traefik/traefik/releases/tag/v3.7.3"}], "affected": [{"vendor": "traefik", "product": "traefik", "versions": [{"version": "< 3.7.3", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-06-23T19:13:28.844Z"}, "descriptions": [{"lang": "en", "value": "Traefik is an HTTP reverse proxy and load balancer. Prior to 3.7.3, there is a critical vulnerability in Traefik's HTTP/3 (QUIC) TLS configuration selection that allows unauthenticated clients to bypass router-specific mTLS enforcement. When HTTP/3 is enabled on an entrypoint, the TLS handshake selects the applicable TLS configuration through an exact, case-sensitive lookup on the SNI value, which fails to match wildcard host patterns (e.g., *.example.com) or case variants of the configured hostname. Because the handshake falls back to the default TLS configuration \u2014 which may not require client certificates \u2014 a client can complete the QUIC handshake without presenting a certificate, while the subsequent HTTP routing layer still dispatches the request to a backend protected by a router-specific mTLS policy. The issue affects deployments where HTTP/3 is enabled, a router uses a wildcard Host rule or case-insensitive hostname matching, a router-specific TLSOptions enforces client certificate authentication, and UDP access to the entrypoint is reachable by an attacker. This vulnerability is fixed in 3.7.3."}], "source": {"advisory": "GHSA-9cr8-q42q-g8m7", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-06-25T12:44:08.806237Z", "id": "CVE-2026-53622", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-25T12:44:19.114Z"}}]}}

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{"bugzilla": {"description": "github.com/traefik/traefik: Traefik: mTLS enforcement bypass due to HTTP/3 TLS configuration flaw", "id": "2491924", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2491924"}, "csaw": false, "cvss3": {"cvss3_base_score": "9.1", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "status": "draft"}, "cwe": "CWE-289", "details": ["A flaw was found in Traefik, an HTTP reverse proxy and load balancer. This critical vulnerability in Traefik's HTTP/3 (QUIC) TLS configuration selection allows unauthenticated clients to bypass router-specific mutual Transport Layer Security (mTLS) enforcement. When HTTP/3 is enabled and a router uses wildcard host rules or case-insensitive hostname matching with client certificate authentication, an attacker can complete the QUIC handshake without presenting a certificate. This bypass grants unauthorized access to a backend that should be protected by mTLS."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, disable HTTP/3 (QUIC) on Traefik entrypoints. This prevents the TLS configuration selection flaw that leads to mTLS bypass. Consult Traefik documentation for specific configuration steps to disable HTTP/3. Restarting the Traefik service will be required for the changes to take effect."}, "name": "CVE-2026-53622", "package_state": [{"cpe": "cpe:/a:redhat:openshift_devspaces:3", "fix_state": "Affected", "package_name": "devspaces/traefik-rhel9", "product_name": "Red Hat OpenShift Dev Spaces"}], "public_date": "2026-06-23T19:13:28Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-53622\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53622\nhttps://github.com/traefik/traefik/releases/tag/v3.7.3\nhttps://github.com/traefik/traefik/security/advisories/GHSA-9cr8-q42q-g8m7"], "statement": "This Important flaw in Traefik, as shipped in Red Hat OpenShift Dev Spaces, allows unauthenticated clients to bypass mutual TLS (mTLS) enforcement when HTTP/3 (QUIC) is enabled. An attacker can gain unauthorized access to mTLS-protected backends if the Traefik router uses wildcard host rules or case-insensitive hostname matching, circumventing expected client certificate authentication.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,3.7.3)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "traefik", "source": "cna", "vendor": "traefik"}, "product": "traefik", "vendor": "traefik"}], "created": "2026-06-23T20:45:06.974083+00:00", "updated": "2026-06-24T13:45:16.889733+00:00", "vendors": ["traefik", "traefik$PRODUCT$traefik"]}