Skip to content
Heist/ feed
Back to feed
Medium

kin-openapi: Unauthenticated panic (DoS) in openapi3filter legacy router via non-canonical/unsupported HTTP method on a static path

Type: advisorySources: OSV

kin-openapi is a Go project for handling OpenAPI files. Prior to 0.145.0, openapi3filter.ValidationHandler uses the routers/legacy router, which passes an unsupported or non-canonical HTTP method for an existing static path to openapi3.PathItem.GetOperation. The default branch of GetOperation panics before authentication runs, so an unauthenticated remote client can repeatedly send methods such as PROPFIND or lowercase get to abort connections and generate stack-trace log growth. The specific panic requires an exact static path; a concrete path matched only by a templated route does not reach the same sink. This issue is fixed in version 0.145.0.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-100347
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 07:17 UTC · Revision 1

Source evidence

kin-openapi: Unauthenticated panic (DoS) in openapi3filter legacy router via non-canonical/unsupported HTTP method on a static path

core-osv · Original source

Published 15 Oct 2026, 15:35 UTC

kin-openapi is a Go project for handling OpenAPI files. Prior to 0.145.0, openapi3filter.ValidationHandler uses the routers/legacy router, which passes an unsupported or non-canonical HTTP method for an existing static path to openapi3.PathItem.GetOperation. The default branch of GetOperation panics before authentication runs, so an unauthenticated remote client can repeatedly send methods such as PROPFIND or lowercase get to abort connections and generate stack-trace log growth. The specific panic requires an exact static path; a concrete path matched only by a templated route does not reach the same sink. This issue is fixed in version 0.145.0.

osv:CVE-2026-100347
Complete source record
{
  "id": "2de5b23b9a9b3d7751bfc28e0245ca5d5073ff9c90cc6f3573d2a84f69b747ec",
  "url": "https://osv.dev/vulnerability/CVE-2026-100347",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "kin-openapi: Unauthenticated panic (DoS) in openapi3filter legacy router via non-canonical/unsupported HTTP method on a static path",
    "summary": "kin-openapi is a Go project for handling OpenAPI files. Prior to 0.145.0, openapi3filter.ValidationHandler uses the routers/legacy router, which passes an unsupported or non-canonical HTTP method for an existing static path to openapi3.PathItem.GetOperation. The default branch of GetOperation panics before authentication runs, so an unauthenticated remote client can repeatedly send methods such as PROPFIND or lowercase get to abort connections and generate stack-trace log growth. The specific panic requires an exact static path; a concrete path matched only by a templated route does not reach the same sink. This issue is fixed in version 0.145.0.",
    "evidence": "osv:CVE-2026-100347",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-100347",
      "aliases": [
        "CVE-2026-100347",
        "GHSA-fh4f-47mf-f2gj"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/getkin/kin-openapi",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "88aa64c7cbd03ecadbb419c473bdcaa8b0124c6b"
                },
                {
                  "fixed": "f1a5b523b82868d2d9be2e116b4e942892be72c3"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.145.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "f1a5b523b82868d2d9be2e116b4e942892be72c3"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "88aa64c7cbd03ecadbb419c473bdcaa8b0124c6b"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v0.145.0"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.144.0",
            "v0.143.0",
            "v0.142.0",
            "v0.141.0",
            "v0.140.0",
            "v0.139.0",
            "v0.138.0",
            "v0.137.0",
            "v0.136.0",
            "v0.135.0",
            "v0.134.0",
            "v0.133.0",
            "v0.132.0",
            "v0.131.0",
            "v0.130.0",
            "v0.129.0",
            "v0.128.0",
            "v0.127.0",
            "v0.126.0",
            "v0.125.0",
            "v0.124.0",
            "v0.123.0",
            "v0.122.0",
            "v0.121.0",
            "v0.120.0",
            "v0.119.0",
            "v0.118.0",
            "v0.117.0",
            "v0.116.0",
            "v0.115.0",
            "v0.114.0",
            "v0.113.0",
            "v0.112.0",
            "v0.111.0",
            "v0.110.0",
            "v0.109.0",
            "v0.108.0",
            "v0.107.0",
            "v0.106.0",
            "v0.105.0",
            "v0.104.0",
            "v0.103.0",
            "v0.102.0",
            "v0.101.0",
            "v0.100.0",
            "v0.99.0",
            "v0.98.0",
            "v0.97.0",
            "v0.96.0",
            "v0.95.0",
            "v0.94.0",
            "v0.93.0",
            "v0.92.0",
            "v0.91.0",
            "v0.90.0",
            "v0.89.0",
            "v0.88.0",
            "v0.87.0",
            "v0.86.0",
            "v0.85.0",
            "v0.84.0",
            "v0.83.0",
            "v0.82.0",
            "v0.81.0",
            "v0.80.0",
            "v0.79.0",
            "v0.78.0",
            "v0.77.0",
            "v0.76.0",
            "v0.75.0",
            "v0.74.0",
            "v0.73.0",
            "v0.72.0",
            "v0.71.0",
            "v0.70.0",
            "v0.69.0",
            "v0.68.0",
            "v0.67.0",
            "v0.66.0",
            "v0.65.0",
            "v0.64.0",
            "v0.63.0",
            "v0.62.0",
            "v0.61.0",
            "v0.60.0",
            "v0.59.0",
            "v0.58.0",
            "v0.57.0",
            "v0.56.0",
            "v0.55.0",
            "v0.54.0",
            "v0.53.0",
            "v0.52.0",
            "v0.51.0",
            "v0.50.0",
            "v0.49.0",
            "v0.48.0",
            "v0.47.0",
            "v0.46.0",
            "v0.45.1",
            "v0.45.0",
            "v0.44.0",
            "v0.43.0",
            "v0.42.0",
            "v0.41.0",
            "v0.40.0",
            "v0.39.0",
            "v0.38.0",
            "v0.37.0",
            "v0.36.0",
            "v0.35.0",
            "v0.34.0",
            "v0.33.0",
            "v0.32.0",
            "v0.31.0",
            "v0.30.0",
            "v0.29.0",
            "v0.28.0",
            "v0.27.0",
            "v0.26.0",
            "v0.25.0",
            "v0.24.0",
            "v0.23.0",
            "v0.22.1",
            "v0.22.0",
            "v0.21.0",
            "v0.20.0",
            "v0.19.0",
            "v0.18.0",
            "v0.17.0",
            "v0.16.0",
            "v0.15.0",
            "v0.14.0",
            "v0.13.0",
            "v0.12.0",
            "v0.11.0",
            "v0.10.0",
            "v0.9.0",
            "v0.8.0",
            "v0.7.0",
            "v0.6.0",
            "v0.5.1",
            "v0.5.0",
            "v0.4.0",
            "v0.3.1",
            "v0.3.0",
            "v0.2.0",
            "v0.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-100347.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:27.079627647Z",
      "provider": "osv",
      "references": [
        "https://github.com/getkin/kin-openapi/releases/tag/v0.145.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100347.json",
        "https://github.com/getkin/kin-openapi/security/advisories/GHSA-fh4f-47mf-f2gj",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-100347",
        "https://github.com/getkin/kin-openapi/commit/f1a5b523b82868d2d9be2e116b4e942892be72c3"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-20",
          "CWE-248"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100347.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-100347",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 493335,
  "published_at": "2026-10-15T15:35:43.874+00:00"
}