CVE-2026-118681 go-chi chi before 5.5.0 Authentication Bypass via SupressNotFound Middleware
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-118681?
CVE-2026-118681 is a medium-severity vulnerability in go-chi chi, published on 28 Oct 2026.
Official description
go-chi chi before 5.5.0 contains an authentication bypass in middleware.SupressNotFound, which calls Match with the live routing context and leaves a mounted router's parameter and child suffix in place for dispatch against the outer router. Unauthenticated attackers can request a mounted path whose suffix matches an outer public route, skipping the mounted authentication middleware and retrieving tenant-scoped data when that outer handler trusts the retained mount parameter.
Weakness: CWE-288
Which versions are affected by CVE-2026-118681?
How do I fix CVE-2026-118681?
No fix has been published for CVE-2026-118681 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-118681 being exploited?
There is no known exploitation of CVE-2026-118681 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-118681, GHSA-r83h-4mhv-9p8m, GHSA-rqrp-8cg2-5958, UBUNTU-CVE-2026-118681.