CVE-2025-66490

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2025-66490
Traefik is an HTTP reverse proxy and load balancer. For versions prior to 2.11.32 and 2.11.31 through 3.6.2, requests using PathPrefix, Path or PathRegex matchers can bypass path normalization. When Traefik uses path-based routing, requests containing URL-encoded restricted characters (/, \, Null, ;, ?, #) can bypass the middleware chain and reach unintended backends. For example, a request to http://mydomain.example.com/admin%2F could reach service-a without triggering my-security-middleware, bypassing security controls for the /admin/ path. This issue is fixed in versions 2.11.32 and 3.6.3.

6.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 2.5

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
https://github.com/traefik/traefik/releases/tag/v2.11.32 Release Notes
https://github.com/traefik/traefik/releases/tag/v3.6.4 Release Notes
https://github.com/traefik/traefik/security/advisories/GHSA-gm3x-23wp-hc2c Exploit Vendor Advisory
https://github.com/traefik/traefik/security/advisories/GHSA-gm3x-23wp-hc2c Exploit Vendor Advisory
Configurations

Configuration 1 (hide)

OR cpe:2.3:a:traefik:traefik:*:*:*:*:*:go:*:*
cpe:2.3:a:traefik:traefik:*:*:*:*:*:go:*:*
History

11 Dec 2025, 18:45

Type Values Removed Values Added
References () https://github.com/traefik/traefik/releases/tag/v2.11.32 - () https://github.com/traefik/traefik/releases/tag/v2.11.32 - Release Notes
References () https://github.com/traefik/traefik/releases/tag/v3.6.4 - () https://github.com/traefik/traefik/releases/tag/v3.6.4 - Release Notes
References () https://github.com/traefik/traefik/security/advisories/GHSA-gm3x-23wp-hc2c - () https://github.com/traefik/traefik/security/advisories/GHSA-gm3x-23wp-hc2c - Exploit, Vendor Advisory
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 6.5
CPE cpe:2.3:a:traefik:traefik:*:*:*:*:*:go:*:*
CWE NVD-CWE-noinfo
First Time Traefik
Traefik traefik

09 Dec 2025, 16:18

Type Values Removed Values Added
References () https://github.com/traefik/traefik/security/advisories/GHSA-gm3x-23wp-hc2c - () https://github.com/traefik/traefik/security/advisories/GHSA-gm3x-23wp-hc2c -

09 Dec 2025, 01:16

Type Values Removed Values Added
New CVE
Information

Published : 2025-12-09 01:16

Updated : 2025-12-11 18:45

NVD link : CVE-2025-66490

Mitre link : CVE-2025-66490

CVE.ORG link : CVE-2025-66490

JSON object : View

Products Affected

traefik

  • traefik
CWE
CWE-436

Interpretation Conflict

NVD-CWE-noinfo