{"id":"CVE-2026-100351","title":"kin-openapi is a Go project for handling OpenAPI files","summary":"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 UseEncodedPa…","severity":"high","cvss":7.4,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","cwe":["CWE-289","CWE-436"],"vendor":"getkin","product":"kin-openapi","affected":["kin-openapi >= 0.144.0, < 0.147.0"],"published":"2026-10-15","updated":"2026-10-15","sourceUpdated":"2026-10-15T17:17:07.520","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-100351","references":[{"url":"https://github.com/getkin/kin-openapi/commit/eda80e2676e9f577ceed2dd80e64f16083edb041","label":"security-advisories@github.com"},{"url":"https://github.com/getkin/kin-openapi/releases/tag/v0.147.0","label":"security-advisories@github.com"},{"url":"https://github.com/getkin/kin-openapi/security/advisories/GHSA-23vg-4cjm-66q5","label":"security-advisories@github.com"},{"url":"https://github.com/getkin/kin-openapi/security/advisories/GHSA-23vg-4cjm-66q5","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-100351"},{"url":"https://github.com/advisories/GHSA-23vg-4cjm-66q5"},{"url":"https://github.com/getkin/kin-openapi"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-100351.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-100351"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2553587"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-100351"},{"url":"https://access.redhat.com/errata/RHSA-2026:76677"},{"url":"https://access.redhat.com/errata/RHSA-2026:85266"},{"url":"https://access.redhat.com/errata/RHSA-2026:82637"}],"tags":["nvd","cve.org","exploit-available","ghsa","go","osv","csaf","vex","red-hat"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"total","timestamp":"2026-10-15T16:09:06.679638Z"},"ingestedAt":"2026-10-15T16:13:10.881Z","aliases":["GHSA-23vg-4cjm-66q5"],"ecosystem":"go","patched":["github.com/getkin/kin-openapi 0.147.0"],"epss":0.00488,"epssPercentile":0.41836,"slug":"CVE-2026-100351","body":"## Overview\n\nkin-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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-100351)\n\nAffected packages:\n\n- `github.com/getkin/kin-openapi >= 0.144.0, < 0.147.0`\n\nPatched in:\n\n- `github.com/getkin/kin-openapi 0.147.0`\n\nSource: https://github.com/advisories/GHSA-23vg-4cjm-66q5\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Red Hat Hardened Images · no fix planned: Red Hat Hardened Images · updated 2026-10-20 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-100351.json)\n- **RHSA-2026:76677** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-10-06 · [advisory](https://access.redhat.com/errata/RHSA-2026:76677)\n- **RHSA-2026:85266** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-10-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:85266)\n- **RHSA-2026:82637** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-10-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:82637)","depth":"midnight","depthScore":53,"depthScoreParts":{"impact":40.7,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":222617,"id":"CVE-2026-100351","ts":1792085005486,"field":"exploit_available","old":"false","new":"true"}]}