{"id":"CVE-2026-118681","state":"PUBLISHED","title":"go-chi chi before 5.5.0 Authentication Bypass via SupressNotFound Middleware","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.","publishedAt":"2026-10-28T18:59:52.523Z","updatedAt":"2026-10-28T18:59:52.523Z","severity":{"score":6.3,"label":"Medium","version":"4.0","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","source":"VulnCheck"},"assigner":"VulnCheck","products":["go-chi chi"],"affected":[{"vendor":"go-chi","product":"chi","packageURL":"pkg:golang/github.com/go-chi/chi/v5","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"5.5.0","versionType":"semver"},{"version":"5.5.0","status":"unaffected","versionType":"semver"}]}],"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"],"weaknesses":["CWE-288"],"ingestedAt":"2026-10-29T20:10:52.580Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/118xxx/CVE-2026-118681.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-118681","state":"PUBLISHED","datePublished":"2026-10-28T18:59:52.523Z","dateUpdated":"2026-10-28T18:59:52.523Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-10-28T17:28:46.441Z"},"containers":{"cna":{"title":"go-chi chi before 5.5.0 Authentication Bypass via SupressNotFound Middleware","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"go-chi","product":"chi","packageURL":"pkg:golang/github.com/go-chi/chi/v5","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"5.5.0","versionType":"semver"},{"version":"5.5.0","status":"unaffected","versionType":"semver"}]}],"references":[{"url":"https://github.com/go-chi/chi/security/advisories/GHSA-rqrp-8cg2-5958","tags":["vendor-advisory"],"name":"GitHub Security Advisory (GHSA-rqrp-8cg2-5958)"},{"url":"https://www.vulncheck.com/advisories/go-chi-chi-before-5.5.0-authentication-bypass-via-supressnotfound-middleware","name":"VulnCheck Advisory: go-chi chi before 5.5.0 Authentication Bypass via SupressNotFound Middleware","tags":["third-party-advisory"]}],"metrics":[{"cvssV4_0":{"version":"4.0","vectorString":"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","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":6.3,"baseSeverity":"MEDIUM"},"format":"CVSS"},{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"NONE","availabilityImpact":"NONE","baseScore":3.7,"baseSeverity":"LOW"},"format":"CVSS"}],"problemTypes":[{"descriptions":[{"cweId":"CWE-288","lang":"en","description":"Authentication Bypass Using an Alternate Path or Channel","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-10-28T18:59:52.523Z"},"datePublic":"2026-10-14T00:00:00.000Z","credits":[{"lang":"en","value":"dpfkdlemtp","type":"reporter"}],"x_generator":{"engine":"vulncheck-endgame"}}}}}