Exploited vulnerability

CVE-2026-65600

TLP:CLEAR

traefik traefik Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Traefik versions = v3.6.0 = 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.

Facts

Vendor: traefik
Product: traefik
EPSS (probability of exploitation within 30 days): 0.6 %
First known exploitation: 21 October 2026
First seen by Risk Letters: 21 October 2026

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Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD