CVE-2025-66490
Last modified
CVE-2025-66490 is a medium-severity vulnerability rated 6.9/10 on the CVSS scale. 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. EPSS estimates a 0.33% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Traefik | Traefik | < 2.11.32 |
| Traefik | Traefik | >= 3.0.0, < 3.6.3 |
References
- https://github.com/traefik/traefik/security/advisories/GHSA-gm3x-23wp-hc2cExploit, Vendor Advisory
- https://github.com/traefik/traefik/security/advisories/GHSA-gm3x-23wp-hc2cExploit, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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