{"id":"CVE-2026-67309","summary":"Traefik v3.7.0 Path Traversal via RewriteTarget Authentication Bypass","details":"Traefik versions \u003e= v3.7.0 and \u003c= 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.","aliases":["GHSA-8rxv-jg7p-wvg3"],"modified":"2026-08-04T11:49:32.688266545Z","published":"2026-08-01T12:22:18.191Z","database_specific":{"cwe_ids":["CWE-22"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67309.json","cna_assigner":"VulnCheck"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67309.json"},{"type":"ADVISORY","url":"https://github.com/traefik/traefik/security/advisories/GHSA-8rxv-jg7p-wvg3"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-67309"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/traefik-path-traversal-via-rewritetarget-authentication-bypass"},{"type":"FIX","url":"https://github.com/traefik/traefik/commit/69259c3acc9d4bdc065cb2e3b83336f7de3e7038"},{"type":"FIX","url":"https://github.com/traefik/traefik/commit/b93f02cd07b79490fb8c8f02e301a7a1ec553195"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/traefik/traefik","events":[{"introduced":"04aa6bb4f9776f2ba87e5cd181d250e3610e6419"},{"fixed":"4a87f05acfa2beb0211cee6e2ad4d002289752b5"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"3.7.0"},{"fixed":"3.7.8"}]}}],"versions":["v3.7.7","v3.7.6","v3.7.5","v3.7.4","v3.7.3","v3.7.2","v3.7.1","v3.7.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-67309.json"}}],"schema_version":"1.8.0","severity":[{"type":"CVSS_V4","score":"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"}]}