{ "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": "2026-09-02T12:04:25.840Z" }, "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/pull/13214", "tags": [ "x_refsource_MISC" ], "url": "https://github.com/traefik/traefik/pull/13214" }, { "name": "https://access.redhat.com/security/cve/CVE-2026-53622", "tags": [ "x_refsource_MISC" ], "url": "https://access.redhat.com/security/cve/CVE-2026-53622" }, { "name": "https://bugzilla.redhat.com/show_bug.cgi?id=2491924", "tags": [ "x_refsource_MISC" ], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2491924" }, { "name": "https://community.traefik.io/t/new-security-update-for-traefik-2-11-2-11-48-3-6-3-6-19-and-3-7-3-7-3/29917", "tags": [ "x_refsource_MISC" ], "url": "https://community.traefik.io/t/new-security-update-for-traefik-2-11-2-11-48-3-6-3-6-19-and-3-7-3-7-3/29917" }, { "name": "https://github.com/traefik/traefik/compare/v3.6.17...v3.6.18", "tags": [ "x_refsource_MISC" ], "url": "https://github.com/traefik/traefik/compare/v3.6.17...v3.6.18" }, { "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" }, { "name": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53622.json", "tags": [ "x_refsource_MISC" ], "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53622.json" } ], "affected": [ { "vendor": "traefik", "product": "traefik", "versions": [ { "version": ">= 3.7.0, < 3.7.3", "status": "affected" }, { "version": ">= 3.0.0, < 3.6.18", "status": "affected" }, { "version": "< 2.11.51", "status": "affected" } ] } ], "providerMetadata": { "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-09-01T21:10:15.076Z" }, "descriptions": [ { "lang": "en", "value": "Traefik is an HTTP reverse proxy and load balancer. Versions prior to 3.7.3, 3.6.18, and 2.11.51 have 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 — which may not require client certificates — 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 versions 3.7.3, 3.6.18, and 2.11.51." } ], "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" } }, { "affected": [ { "collectionURL": "https://catalog.redhat.com/software/containers/", "cpes": [ "cpe:/a:redhat:openshift_devspaces:3.30::el9" ], "defaultStatus": "affected", "packageName": "devspaces/traefik-rhel9", "product": "Red Hat OpenShift Dev Spaces 3.30", "vendor": "Red Hat", "versions": [ { "lessThan": "*", "status": "unaffected", "version": "1787756799", "versionType": "rpm" } ] } ], "datePublic": "2026-06-23T19:13:28.844Z", "descriptions": [ { "lang": "en", "value": "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." } ], "metrics": [ { "other": { "content": { "namespace": "https://access.redhat.com/security/updates/classification/", "value": "Important" }, "type": "Red Hat severity rating" } }, { "cvssV3_1": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 9.1, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "version": "3.1" }, "format": "CVSS" } ], "problemTypes": [ { "descriptions": [ { "cweId": "CWE-289", "description": "Authentication Bypass by Alternate Name", "lang": "en", "type": "CWE" } ] } ], "references": [ { "tags": [ "vdb-entry", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/security/cve/CVE-2026-53622" }, { "name": "RHBZ#2491924", "tags": [ "issue-tracking", "x_refsource_REDHAT" ], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2491924" }, { "tags": [ "x_sadp-csaf-vex" ], "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53622.json" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:62260" } ], "solutions": [ { "lang": "en", "value": "RHSA-2026:62260: Red Hat OpenShift Dev Spaces 3.30" } ], "timeline": [ { "lang": "en", "time": "2026-06-23T20:01:29.612Z", "value": "Reported to Red Hat." }, { "lang": "en", "time": "2026-06-23T19:13:28.844Z", "value": "Made public." } ], "title": "github.com/traefik/traefik: Traefik: mTLS enforcement bypass due to HTTP/3 TLS configuration flaw", "workarounds": [ { "lang": "en", "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." } ], "x_adpType": "supplier", "x_generator": { "engine": "sadp-cli 1.0.0" }, "providerMetadata": { "orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "shortName": "redhat-SADP", "dateUpdated": "2026-09-02T12:04:25.840Z" } } ] } }