CVE-2026-65600 Details
Description
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.
An authentication bypass vulnerability has been identified in Traefik versions through v2.11.51, v3.6.0 prior to v3.6.23, and v3.7.0 prior to v3.7.7. The issue arises in the ReplacePathRegex middleware, which can be exploited when configured with a regular expression that captures user-controlled path segments without a mandatory path separator. This allows an unauthenticated remote attacker to send a crafted request that produces an un-normalized path, such as /../admin. When this path is processed by a backend that normalizes paths, it may be resolved to a protected route, effectively bypassing authentication middleware.
Users can upgrade to Traefik versions v2.11.52, v3.6.23, or v3.7.7 to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jul 23, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/traefik/traefik/security/advisories/GHSA-cxjq-mrr5-89rv | [email protected] | Vendor AdvisoryPatch |
| https://www.vulncheck.com/advisories/traefik-before-authentication-bypass-via-replacepathregex | [email protected] | Third Party Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-22 | Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| traefik traefik | < 2.11.52 >= 3.6.0, < 3.6.23 >= 3.7.0, < 3.7.7 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Aug 6, 2026 | Initial Analysis | [email protected] |
| Jul 23, 2026 | CVE Modified | CISA-ADP |
| Jul 22, 2026 | New CVE Received | [email protected] |