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CVE-2026-65600

CVE-2026-65600 · Traefik before v2.11.52 Authentication Bypass via ReplacePathRegex

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 7.8 · High · EPSS 0.6% · Fix available

Published
Updated

Stack: web

Affected products and versions

  • traefik

    Versions
    • ≥ 0, < 2.11.52: Affected (semver)
    • 2.11.52: Not affected (semver)

    Update to 2.11.52

  • traefik

    Versions
    • ≥ 3.6.0, < 3.6.23: Affected (semver)
    • 3.6.23: Not affected (semver)

    Update to 3.6.23

  • traefik

    Versions
    • ≥ 3.7.0, < 3.7.7: Affected (semver)
    • 3.7.7: Not affected (semver)

    Update to 3.7.7

Original sources

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