Vulnerability in Traefik
CVE-2026-41263
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 timing side-channel vulnerability in Traefik's BasicAuth middleware that allows an attacker to enumerate valid usernames thro…
EPSS: 0.000 (6.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/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-6x2q-h3cr-8j2h (x_refsource_CONFIRM, 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-2026-41263?
- CVE-2026-41263 is a low-severity vulnerability in Traefik, classified under CWE-208. CVSS score: 3.7/10. Published 2026-04-30.
- How severe is CVE-2026-41263?
- Low severity. CVSS v3 base score is 3.7 out of 10.