CVE-2026-65600Medium· 5.3▾ SunlitTraefik 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-contr…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 29.2 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Aug 6.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.7%
Last analysed / modified upstream
9.1 → 5.3
critical → medium
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.
traefik < 2.11.52traefik >= 3.6.0, < 3.6.23traefik >= 3.7.0, < 3.7.7Upgrade past the affected range:
traefik 3.7.7Affected packages:
github.com/traefik/traefik/v2 <= 2.11.51github.com/traefik/traefik/v3 <= 3.6.22github.com/traefik/traefik/v3 >= 3.7.0, <= 3.7.6github.com/traefik/traefik <= 1.7.34Patched in:
github.com/traefik/traefik/v2 2.11.52github.com/traefik/traefik/v3 3.6.23github.com/traefik/traefik/v3 3.7.7Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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