Vulnerability in Traefik
CVE-2026-40912
Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a high severity authentication bypass vulnerability in Traefik's StripPrefixRegex middleware when used in combination with Forw…
EPSS: 0.001 (26.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N.
Affected products
- Traefik — versions 3.7.0, >= 3.0.0-beta1, < 3.6.14, < 2.11.43
Weakness classification (CWE)
References
- https://github.com/traefik/traefik/security/advisories/GHSA-6jwx-7vp4-9847 (x_refsource_CONFIRM, Exploit, Patch, Vendor Advisory)
- https://github.com/traefik/traefik/releases/tag/v2.11.43 (Product, x_refsource_MISC, Release Notes)
- https://github.com/traefik/traefik/releases/tag/v3.6.14 (Product, x_refsource_MISC, Release Notes)
- https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2 (Product, x_refsource_MISC, Release Notes)
Frequently asked questions
- What is CVE-2026-40912?
- CVE-2026-40912 is a high-severity vulnerability in Traefik, classified under Use of Incorrectly-Resolved Name or Reference. CVSS score: 8.2/10. Published 2026-04-30.
- How severe is CVE-2026-40912?
- High severity. CVSS v3 base score is 8.2 out of 10.