{"cve":"CVE-2026-100351","nvd":{"published":"2026-10-15T16:17:31.110","modified":"2026-10-15T17:17:07.520","status":"Deferred","description":"kin-openapi is a Go project for handling OpenAPI files. From 0.144.0 until 0.147.0, openapi3filter.ValidationHandler validates an operation selected from decoded URL.Path while a downstream gorilla/mux router configured with UseEncodedPath can dispatch a different operation selected from URL.RawPath. When a public exact route and a protected parameterized route use the same method and overlap after decoding, an unauthenticated remote request containing an encoded path separator can be validated as public and then dispatched to the protected handler without invoking the configured AuthenticationFunc. The reachable path parameter is constrained to an encoded representation that decodes to the public literal route, and proxies that canonicalize the URI before forwarding prevent this specific mismatch. This issue is fixed in version 0.147.0.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","score":7.4},"cwes":["CWE-289","CWE-436"],"references":["https://github.com/getkin/kin-openapi/commit/eda80e2676e9f577ceed2dd80e64f16083edb041","https://github.com/getkin/kin-openapi/releases/tag/v0.147.0","https://github.com/getkin/kin-openapi/security/advisories/GHSA-23vg-4cjm-66q5","https://github.com/getkin/kin-openapi/security/advisories/GHSA-23vg-4cjm-66q5"],"products":[],"source":"nvd","synced_at":"2026-10-19T23:00:53.604569364+00:00"},"epss":{"cve":"CVE-2026-100351","score":0.00488,"percentile":0.41741,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-23vg-4cjm-66q5","url":"https://osv.dev/vulnerability/GHSA-23vg-4cjm-66q5","summary":"kin-openapi: ValidationHandler security-requirement bypass via encoded-path operation confusion","modified":"2026-10-15T20:30:05.450347889Z","packages":[{"ecosystem":"Go","name":"github.com/getkin/kin-openapi","purl":"pkg:golang/github.com/getkin/kin-openapi","ranges":[">=0.144.0 <0.147.0"],"fixed":["0.147.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}