Vulnerability in Traefik

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, request…

EPSS: 0.003 (24.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.

Affected products

  • Traefik — versions github.com/traefik/traefik/v3 < 3.6.3, github.com/traefik/traefik/v2 < 2.11.32, github.com/traefik/traefik <= 1.7.34

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2025-66490?
CVE-2025-66490 is a medium-severity vulnerability in Traefik, classified under CWE-436. CVSS score: 6.5/10. Published 2025-12-09.
How severe is CVE-2025-66490?
Medium severity. CVSS v3 base score is 6.5 out of 10.