Vulnerability in Go-Chi Chi
CVE-2026-118681
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.
Published · last modified .
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.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/go-chi/chi/security/advisories/GHSA-rqrp-8cg2-5958 (vendor-advisory)
- www.vulncheck.com/advisories/go-chi-chi-before-5.5.0-authentication-bypass-via-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-118681?
- CVE-2026-118681 is a low-severity vulnerability in Go-Chi Chi, classified under Authentication Bypass Using an Alternate Path or Channel. CVSS score: 3.7/10. Published 2026-10-28.
- How severe is CVE-2026-118681?
- Low severity. CVSS v3 base score is 3.7 out of 10.