FKIE_CVE-2026-73502

Vulnerability from fkie_nvd - Published: 2026-08-18 18:19 - Updated: 2026-08-18 19:17
Severity
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Summary
kin-openapi is a Go project for handling OpenAPI files. From 0.2.0 until 0.144.0, openapi3filter.ValidateRequest can encounter a NULL-pointer-dereference denial of service when an operation declares a content parameter whose application/json media type has no schema. In openapi3filter/req_resp_decoder.go, the default defaultContentParameterDecoder dereferences mt.Schema.Value without checking whether mt.Schema is nil, even though doc.Validate() accepts the document under OpenAPI 3.0.x and 3.1.x. A single unauthenticated request supplying the parameter value can panic request validation, causing an aborted request with log growth in the common synchronous net/http path or a full process crash in integrations without recovery. This issue is fixed in version 0.144.0.
References
security-advisories@github.comhttps://github.com/getkin/kin-openapi/commit/68ac2affa325514d7d6e731204d6a1edf6bdff64
security-advisories@github.comhttps://github.com/getkin/kin-openapi/releases/tag/v0.144.0
security-advisories@github.comhttps://github.com/getkin/kin-openapi/security/advisories/GHSA-jpcw-4wr7-c3vq
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/getkin/kin-openapi/security/advisories/GHSA-jpcw-4wr7-c3vq
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "kin-openapi",
          "vendor": "getkin",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 0.2.0, \u003c 0.144.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "kin-openapi is a Go project for handling OpenAPI files. From 0.2.0 until 0.144.0, openapi3filter.ValidateRequest can encounter a NULL-pointer-dereference denial of service when an operation declares a content parameter whose application/json media type has no schema. In openapi3filter/req_resp_decoder.go, the default defaultContentParameterDecoder dereferences mt.Schema.Value without checking whether mt.Schema is nil, even though doc.Validate() accepts the document under OpenAPI 3.0.x and 3.1.x. A single unauthenticated request supplying the parameter value can panic request validation, causing an aborted request with log growth in the common synchronous net/http path or a full process crash in integrations without recovery. This issue is fixed in version 0.144.0."
    }
  ],
  "id": "CVE-2026-73502",
  "lastModified": "2026-08-18T19:17:03.923",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-73502",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-18T18:42:00.680845Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-18T18:19:33.460",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/getkin/kin-openapi/commit/68ac2affa325514d7d6e731204d6a1edf6bdff64"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/getkin/kin-openapi/releases/tag/v0.144.0"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/getkin/kin-openapi/security/advisories/GHSA-jpcw-4wr7-c3vq"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/getkin/kin-openapi/security/advisories/GHSA-jpcw-4wr7-c3vq"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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