CVE-2026-48020
Critical · 10.0CVSS
10.0
EPSS
0.8%
Published
Jun 23, 2026
CISA due date
—
The record
Traefik is an HTTP reverse proxy and load balancer. Prior to 2.11.48, 3.6.19, and 3.7.3, there is a high severity vulnerability in Traefik's StripPrefix middleware that allows an unauthenticated attacker to bypass route-level authentication and authorization. When a public router matches on a PathPrefix rule and applies the StripPrefix middleware, a request path containing .. or its percent-encoded form %2e%2e can match the public route at routing time and then, after the prefix is stripped and the path is normalized, resolve to a path served by a separate, authenticated router. As a result, an attacker can reach protected backend paths — such as admin or internal configuration endpoints — without satisfying the authentication middleware attached to the protected router. This vulnerability is fixed in 2.11.48, 3.6.19, and 3.7.3.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| openSUSE:Tumbleweed | traefik | 0 | 3.7.5-1.1 |
| openSUSE:Tumbleweed | traefik2 | 0 | 2.11.50-1.1 |
Related vulnerabilities
- CVE-2026-48491 Traefik is an HTTP reverse proxy and load balancer. Also affects traefik
- CVE-2026-53622 Traefik is an HTTP reverse proxy and load balancer. Also affects traefik
- CVE-2026-44774 Traefik is an HTTP reverse proxy and load balancer. Also affects traefik
- CVE-2026-41181 Traefik is an HTTP reverse proxy and load balancer. Also affects traefik
- CVE-2026-41174 Traefik is an HTTP reverse proxy and load balancer. Also affects traefik
- CVE-2026-41263 Traefik is an HTTP reverse proxy and load balancer. Also affects traefik
- CVE-2026-35051 Traefik is an HTTP reverse proxy and load balancer. Also affects traefik
- CVE-2026-39858 Traefik is an HTTP reverse proxy and load balancer. Also affects traefik