Path Traversal in Traefik
CVE-2026-65600
Traefik versions <= v2.11.51, >= v3.6.0 <= v3.6.22, and >= v3.7.0 <= v3.7.6 contain an authentication bypass via path traversal in the ReplacePathRegex middleware. When ReplacePathRegex is configured with a regex that captures user-controlled path segments without a mandatory path separator (e.g. regex "^/api(.*)", replacement "/$1"), the middleware forwards the replaced path to the backend without validating that it matches its normalized form. An unauthenticated remote attacker can send a crafted request (e.g. GET /api../admin) that produces an un-normalized path such as /../admin, which a backend that normalizes paths resolves to a protected route, bypassing authentication middleware. Fixed in v2.11.52, v3.6.23, and v3.7.7.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS 0.005, 43.4th percentile (scored ); unchanged over 30 days. About EPSS.
Affected products
- Traefik — versions 0, 2.11.52, 3.6.0
Weakness classification (CWE)
Public exploits and proof-of-concept code
1 public repository with exploit or proof-of-concept code for this CVE:
- federiconbaez/cortex9-traefik-replacepathregex-normalization-model (last pushed 2026-11-09): Offline educational model of CVE-2026-65600 (Traefik ReplacePathRegex path normalization / auth bypass)
References
- GitHub Security Advisory (GHSA-cxjq-mrr5-89rv) (vendor-advisory, Patch, Vendor Advisory)
- VulnCheck Advisory: Traefik before v2.11.52 Authentication Bypass via ReplacePathRegex (Third Party Advisory, third-party-advisory)
This CVE has public exploit evidence. See the latest CVEs with public exploits.