{"id":"GHSA-7qf5-7ppr-87v8","summary":"Duplicate Advisory: Kubernetes Ingress NGINX RewriteTarget Path Traversal Allows Route-Level Authentication Bypass","details":"## Duplicate Advisory\n\nThis advisory has been withdrawn because it is a duplicate of GHSA-8rxv-jg7p-wvg3. This link is maintained to preserve external references.\n\n## Original Description\n\nTraefik 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 The issue is fixed in v3.7.8.","modified":"2026-08-06T17:00:56.653234544Z","published":"2026-08-01T15:30:27Z","withdrawn":"2026-08-06T16:45:13Z","database_specific":{"github_reviewed":true,"github_reviewed_at":"2026-08-06T16:45:13Z","nvd_published_at":"2026-08-01T13:17:00Z","cwe_ids":["CWE-22"],"severity":"HIGH"},"references":[{"type":"WEB","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":"WEB","url":"https://github.com/traefik/traefik/commit/69259c3acc9d4bdc065cb2e3b83336f7de3e7038"},{"type":"WEB","url":"https://github.com/traefik/traefik/commit/b93f02cd07b79490fb8c8f02e301a7a1ec553195"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/traefik-path-traversal-via-rewritetarget-authentication-bypass"}],"affected":[{"package":{"name":"github.com/traefik/traefik/v3","ecosystem":"Go","purl":"pkg:golang/github.com/traefik/traefik/v3"},"ranges":[{"type":"SEMVER","events":[{"introduced":"3.7.0"},{"last_affected":"3.7.7"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-7qf5-7ppr-87v8/GHSA-7qf5-7ppr-87v8.json"}}],"schema_version":"1.9.0","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"}]}