{"id":"CVE-2026-67309","state":"PUBLISHED","title":"Traefik v3.7.0 Path Traversal via RewriteTarget Authentication Bypass","description":"Traefik versions >= v3.7.0 and <= v3.7.7 contain a path traversal vulnerability in the Kubernetes Ingress NGINX provider's RewriteTarget middleware (generated from the nginx.ingress.kubernetes.io/rewrite-target annotation). When an Ingress path uses a regex that captures attacker-controlled text without requiring a path separator (e.g., path /api(.*) with rewrite target /$1), a crafted request such as /api../admin matches the public router, is rewritten to a dot-segment traversal path (/../admin), and is forwarded without post-replacement normalization validation. A backend that normalizes dot segments resolves the path to a protected endpoint (e.g., /admin) reachable only through a separate router secured with BasicAuth, DigestAuth, or ForwardAuth, resulting in route-level authentication bypass. The issue is fixed in v3.7.8.","publishedAt":"2026-08-01T12:22:18.191Z","updatedAt":"2026-10-08T15:24:04.107Z","severity":{"score":7.8,"label":"High","version":"4.0","vector":"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","source":"VulnCheck"},"assigner":"VulnCheck","products":["traefik traefik"],"affected":[{"vendor":"traefik","product":"traefik","packageURL":"pkg:golang/github.com/traefik/traefik/v3","defaultStatus":"unaffected","versions":[{"version":"3.7.0","status":"affected","lessThan":"3.7.8","versionType":"semver"},{"version":"3.7.8","status":"unaffected","versionType":"semver"}]}],"references":["https://github.com/traefik/traefik/security/advisories/GHSA-8rxv-jg7p-wvg3","https://github.com/traefik/traefik/commit/b93f02cd07b79490fb8c8f02e301a7a1ec553195","https://github.com/traefik/traefik/commit/69259c3acc9d4bdc065cb2e3b83336f7de3e7038","https://www.vulncheck.com/advisories/traefik-path-traversal-via-rewritetarget-authentication-bypass"],"weaknesses":["CWE-22"],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/67xxx/CVE-2026-67309.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-67309","state":"PUBLISHED","datePublished":"2026-08-01T12:22:18.191Z","dateUpdated":"2026-10-08T15:24:04.107Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-07-29T13:06:35.178Z"},"containers":{"cna":{"title":"Traefik v3.7.0 Path Traversal via RewriteTarget Authentication Bypass","descriptions":[{"lang":"en","value":"Traefik versions >= v3.7.0 and <= v3.7.7 contain a path traversal vulnerability in the Kubernetes Ingress NGINX provider's RewriteTarget middleware (generated from the nginx.ingress.kubernetes.io/rewrite-target annotation). When an Ingress path uses a regex that captures attacker-controlled text without requiring a path separator (e.g., path /api(.*) with rewrite target /$1), a crafted request such as /api../admin matches the public router, is rewritten to a dot-segment traversal path (/../admin), and is forwarded without post-replacement normalization validation. A backend that normalizes dot segments resolves the path to a protected endpoint (e.g., /admin) reachable only through a separate router secured with BasicAuth, DigestAuth, or ForwardAuth, resulting in route-level authentication bypass. The issue is fixed in v3.7.8."}],"affected":[{"vendor":"traefik","product":"traefik","packageURL":"pkg:golang/github.com/traefik/traefik/v3","defaultStatus":"unaffected","versions":[{"version":"3.7.0","status":"affected","lessThan":"3.7.8","versionType":"semver"},{"version":"3.7.8","status":"unaffected","versionType":"semver"}]}],"references":[{"url":"https://github.com/traefik/traefik/security/advisories/GHSA-8rxv-jg7p-wvg3","tags":["vendor-advisory"],"name":"GitHub Security Advisory (GHSA-8rxv-jg7p-wvg3)"},{"url":"https://github.com/traefik/traefik/commit/b93f02cd07b79490fb8c8f02e301a7a1ec553195","tags":["patch"],"name":"Patch Commit"},{"url":"https://github.com/traefik/traefik/commit/69259c3acc9d4bdc065cb2e3b83336f7de3e7038","tags":["patch"],"name":"Patch Commit"},{"url":"https://www.vulncheck.com/advisories/traefik-path-traversal-via-rewritetarget-authentication-bypass","name":"VulnCheck Advisory: Traefik v3.7.0 Path Traversal via RewriteTarget Authentication Bypass","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","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","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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-22","lang":"en","description":"Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-10-08T15:24:04.107Z"},"datePublic":"2026-07-16T00:00:00.000Z","cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7.0","versionEndExcluding":"3.7.8"}]}]}],"credits":[{"lang":"en","value":"B1gN0Se","type":"reporter"}],"x_generator":{"engine":"vulncheck-endgame"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-03T16:00:21.665723Z","id":"CVE-2026-67309","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-03T16:00:57.468Z"}}]}}}