{"id":"CVE-2026-67309","aliases":["GHSA-8rxv-jg7p-wvg3","GO-2026-6207"],"url":"https://o3.security/vulnerability/CVE-2026-67309","summary":"Traefik v3.7.0 Path Traversal via RewriteTarget Authentication Bypass","details":"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.","published":"2026-08-01T12:22:18.191Z","modified":"2026-09-11T03:31:04.308690743Z","cvss":null,"epss":{"score":0.00492,"percentile":0.40199,"asOf":"2026-08-27"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/traefik/traefik/v3","fixedVersion":"3.7.8"}],"fix":{"url":"https://github.com/traefik/traefik/commit/69259c3acc9d4bdc065cb2e3b83336f7de3e7038","label":"traefik/traefik@69259c3"},"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"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-11T03:31:04.308690743Z"}}