{"id":"CVE-2026-118681","aliases":[],"cve":{"records":[{"id":"CVE-2026-118681","source":"VulnCheck","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-10-28T17:28:46.441Z","published":"2026-10-28T18:59:52.523Z","modified":"2026-10-28T18:59:52.523Z"}],"publishers":[{"name":"VulnCheck","role":"CNA","organizationId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","modified":"2026-10-28T18:59:52.523Z"}],"references":[{"url":"https://github.com/go-chi/chi/security/advisories/GHSA-rqrp-8cg2-5958","tags":["vendor-advisory"],"source":"VulnCheck"},{"url":"https://www.vulncheck.com/advisories/go-chi-chi-before-5.5.0-authentication-bypass-via-supressnotfound-middleware","tags":["third-party-advisory"],"source":"VulnCheck"}],"weaknesses":[{"id":"CWE-288","description":"Authentication Bypass Using an Alternate Path or Channel","source":"VulnCheck"}],"applicability":[],"prioritization":[]},"title":"go-chi chi before 5.5.0 Authentication Bypass via SupressNotFound Middleware","titleSource":"VulnCheck","descriptionSource":"VulnCheck","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.","score":6.3,"severity":"medium","published":"2026-10-28T18:59:52.523Z","modified":"2026-10-28T18:59:52.523Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"go-chi","name":"chi","platforms":[],"versions":[{"version":"0","status":"affected","lessThan":"5.5.0","versionType":"semver"},{"version":"5.5.0","status":"unaffected","versionType":"semver"}],"defaultStatus":"unaffected","packageURL":"pkg:golang/github.com/go-chi/chi/v5","packageIdentity":{"ecosystem":"Go","name":"github.com/go-chi/chi/v5"},"cpes":[],"source":"VulnCheck","url":"https://www.cve.org/CVERecord?id=CVE-2026-118681"}],"remediation":[],"references":["https://github.com/go-chi/chi/security/advisories/GHSA-rqrp-8cg2-5958","https://www.vulncheck.com/advisories/go-chi-chi-before-5.5.0-authentication-bypass-via-supressnotfound-middleware"],"sources":[{"name":"CVE","id":"CVE-2026-118681","modified":"2026-10-28T18:59:52.523Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-118681"}],"assessments":[{"source":"VulnCheck","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","score":6.3},{"source":"VulnCheck","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","score":3.7}],"sourceAffected":[],"observedAt":"2026-10-29T14:37:36.893Z","kev":{"status":"not-listed","checkedAt":"2026-10-31T05:20:32.057Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[],"aiSummary":{"text":"go-chi chi versions before 5.5.0 have an authentication bypass via the SupressNotFound middleware, allowing unauthenticated attackers to access tenant-scoped data. The vulnerability occurs when a mounted path's suffix matches an outer public route. Attackers need access to the mounted path to exploit the weakness.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-10-30T09:54:54.329Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-118681"}]}}