CVE-2026-100351

{
  "etk_id": "ETK-2026-2133",
  "cve_id": "CVE-2026-100351",
  "display_id": "CVE-2026-100351",
  "ghsa_id": "GHSA-23vg-4cjm-66q5",
  "euvd_id": "EUVD-2026-102160",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Authentication bypass in kin-openapi ValidationHandler routing",
  "summary": "kin-openapi versions before v0.147.0 can validate a decoded request path as a public OpenAPI operation while an encoded-path-aware downstream gorilla/mux router dispatches it to a protected handler. An unauthenticated requester may bypass the configured authentication callback when the application uses ValidationHandler.Middleware as its security gate and has same-method public and protected routes that overlap after path decoding.",
  "mitigation": "Upgrade github.com/getkin/kin-openapi to v0.147.0 or later. Until upgraded, ensure the validation layer and downstream router use identical path-normalization semantics, and avoid preserving encoded path separators between them.",
  "vendor": "go",
  "product": "github.com/getkin/kin-openapi",
  "affected": [
    {
      "affected_notes": [
        "v0.144.0 through v0.146.0"
      ],
      "affected_ranges": [],
      "ecosystem": "go",
      "fixed_versions": [
        "v0.147.0"
      ],
      "package_name": "github.com/getkin/kin-openapi",
      "purl": "pkg:golang/github.com/getkin/kin-openapi"
    }
  ],
  "cwes": [
    289
  ],
  "cvss_score": 7.4,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
  "epss_score": 0.0049,
  "epss_percentile": 0.4079,
  "epss_asof": "2026-10-20",
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 7.9045445,
  "t0_at": "2026-10-15T15:52:30.041000+00:00",
  "signals": {
    "public_poc": {
      "at": "2026-08-18T14:15:37+00:00",
      "days": -58.06728056712963,
      "is_lower_bound": false,
      "measured_at": "2026-10-15T15:52:30.041000+00:00",
      "url": "https://github.com/getkin/kin-openapi/security/advisories/GHSA-23vg-4cjm-66q5"
    },
    "trigger_signal": {
      "at": "2026-10-15T15:52:30.041000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-15T15:52:30.041000+00:00",
      "url": "https://github.com/getkin/kin-openapi/security/advisories/GHSA-23vg-4cjm-66q5"
    }
  }
}