CVE-2026-48020
criticalTraefik is an HTTP reverse proxy and load balancer.
Vendor / product: Traefik — traefik
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N Affected products
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
References
- https://github.com/traefik/traefik/releases/tag/v2.11.48 security-advisories@github.com
- https://github.com/traefik/traefik/releases/tag/v3.6.19 security-advisories@github.com
- https://github.com/traefik/traefik/releases/tag/v3.7.3 security-advisories@github.com
- https://github.com/traefik/traefik/security/advisories/GHSA-xf64-8mw2-4gr2 security-advisories@github.com
- https://access.redhat.com/errata/RHSA-2026:62260 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- https://access.redhat.com/security/cve/CVE-2026-48020 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- https://bugzilla.redhat.com/show_bug.cgi?id=2491915 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-48020.json 0b0ca135-0b70-47e7-9f44-1890c2a1c46c