Vulnerability in Traefik
CVE-2026-35051
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 an authentication bypass vulnerability in Traefik's ForwardAuth middleware when trustForwardHeader=false is configured and Traefik is deployed behind a trusted upstream proxy. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.003 (22.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 22nd percentile — 22.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000
Affected products
- Traefik — versions 3.7.0, >= 3.0.0-beta1, < 3.6.14, < 2.11.43
Weakness classification (CWE)
References
- github.com/traefik/traefik/security/advisories/GHSA-6384-m2mw-rf54 (Exploit, Patch, Vendor Advisory)
- github.com/traefik/traefik/releases/tag/v2.11.43 (Product, Release Notes)
- github.com/traefik/traefik/releases/tag/v3.6.14 (Product, Release Notes)
- github.com/traefik/traefik/releases/tag/v3.7.0-rc.2 (Product, Release Notes)
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Frequently asked questions
- What is CVE-2026-35051?
- CVE-2026-35051 is a critical-severity vulnerability in Traefik, classified under Insufficient Verification of Data Authenticity. CVSS score: 10.0/10. Published 2026-04-30.
- How severe is CVE-2026-35051?
- Critical severity. CVSS v3 base score is 10.0 out of 10.