CVE-2026-73502 (GCVE-0-2026-73502)

Vulnerability from cvelistv5 – Published: 2026-08-18 17:58 – Updated: 2026-08-18 18:42
VLAI
Title
kin-openapi openapi3filter: unauthenticated nil-pointer panic when validating a request against a `content` parameter whose media type has no schema
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.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-18 18:42 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7838 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
getkin kin-openapi Affected: >= 0.2.0, < 0.144.0
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-73502",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-18T18:42:00.680845Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-18T18:42:16.744Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/getkin/kin-openapi/security/advisories/GHSA-jpcw-4wr7-c3vq"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "kin-openapi",
          "vendor": "getkin",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 0.2.0, \u003c 0.144.0"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "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"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-476",
              "description": "CWE-476: NULL Pointer Dereference",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-18T17:58:21.320Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/getkin/kin-openapi/security/advisories/GHSA-jpcw-4wr7-c3vq",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/getkin/kin-openapi/security/advisories/GHSA-jpcw-4wr7-c3vq"
        },
        {
          "name": "https://github.com/getkin/kin-openapi/commit/68ac2affa325514d7d6e731204d6a1edf6bdff64",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/getkin/kin-openapi/commit/68ac2affa325514d7d6e731204d6a1edf6bdff64"
        },
        {
          "name": "https://github.com/getkin/kin-openapi/releases/tag/v0.144.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/getkin/kin-openapi/releases/tag/v0.144.0"
        }
      ],
      "source": {
        "advisory": "GHSA-jpcw-4wr7-c3vq",
        "discovery": "UNKNOWN"
      },
      "title": "kin-openapi openapi3filter: unauthenticated nil-pointer panic when validating a request against a `content` parameter whose media type has no schema"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-73502",
    "datePublished": "2026-08-18T17:58:21.320Z",
    "dateReserved": "2026-08-12T19:00:33.736Z",
    "dateUpdated": "2026-08-18T18:42:16.744Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-73502",
      "date": "2026-10-27",
      "epss": "0.00507",
      "percentile": "0.43039"
    },
    "nvd": {
      "cve": {
        "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."
          },
          {
            "lang": "es",
            "value": "kin-openapi es un proyecto Go para manejar archivos OpenAPI. Desde 0.2.0 hasta 0.144.0, openapi3filter.ValidateRequest puede encontrar una denegaci\u00f3n de servicio por desreferencia de puntero NULL cuando una operaci\u00f3n declara un par\u00e1metro de contenido cuyo tipo de medio application/json no tiene esquema. En openapi3filter/req_resp_decoder.go, el defaultContentParameterDecoder predeterminado desreferencia mt.Schema.Value sin verificar si mt.Schema es nulo, a pesar de que doc.Validate() acepta el documento bajo OpenAPI 3.0.x y 3.1.x. Una \u00fanica solicitud no autenticada que proporciona el valor del par\u00e1metro puede causar un p\u00e1nico en la validaci\u00f3n de la solicitud, provocando una solicitud abortada con crecimiento de registros en la ruta s\u00edncrona com\u00fan de net/HTTP o un fallo completo del proceso en integraciones sin recuperaci\u00f3n. Este problema est\u00e1 solucionado en la versi\u00f3n 0.144.0."
          }
        ],
        "id": "CVE-2026-73502",
        "lastModified": "2026-10-22T22:10:00.250",
        "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": "Deferred",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-476"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Secondary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-22T05:53:52+00:00",
      "cve": "CVE-2026-73502",
      "id": "CVE-2026-73502",
      "initial_release_date": "2026-08-18T17:58:21.320000+00:00",
      "product_status:fixed": "62",
      "product_status:known_affected": "62",
      "product_status:known_not_affected": "927",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "github.com/getkin/kin-openapi: kin-openapi: Denial of Service via unauthenticated nil-pointer dereference",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-73502.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-05T00:29:05Z",
      "cve": "CVE-2026-73502",
      "id": "CVE-2026-73502",
      "initial_release_date": "2026-09-05T00:29:05Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-73502",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-73502.json",
      "version": "2"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-73502",
                    "options": [
                      {
                        "Exploitation": "poc"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-08-18T18:42:00.680845Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-08-18T18:42:12.808Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "references": [
              {
                "tags": [
                  "exploit"
                ],
                "url": "https://github.com/getkin/kin-openapi/security/advisories/GHSA-jpcw-4wr7-c3vq"
              }
            ],
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "product": "kin-openapi",
              "vendor": "getkin",
              "versions": [
                {
                  "status": "affected",
                  "version": "\u003e= 0.2.0, \u003c 0.144.0"
                }
              ]
            }
          ],
          "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."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "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"
              }
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-476",
                  "description": "CWE-476: NULL Pointer Dereference",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-18T17:58:21.320Z",
            "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
            "shortName": "GitHub_M"
          },
          "references": [
            {
              "name": "https://github.com/getkin/kin-openapi/security/advisories/GHSA-jpcw-4wr7-c3vq",
              "tags": [
                "x_refsource_CONFIRM"
              ],
              "url": "https://github.com/getkin/kin-openapi/security/advisories/GHSA-jpcw-4wr7-c3vq"
            },
            {
              "name": "https://github.com/getkin/kin-openapi/commit/68ac2affa325514d7d6e731204d6a1edf6bdff64",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/getkin/kin-openapi/commit/68ac2affa325514d7d6e731204d6a1edf6bdff64"
            },
            {
              "name": "https://github.com/getkin/kin-openapi/releases/tag/v0.144.0",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/getkin/kin-openapi/releases/tag/v0.144.0"
            }
          ],
          "source": {
            "advisory": "GHSA-jpcw-4wr7-c3vq",
            "discovery": "UNKNOWN"
          },
          "title": "kin-openapi openapi3filter: unauthenticated nil-pointer panic when validating a request against a `content` parameter whose media type has no schema"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "assignerShortName": "GitHub_M",
        "cveId": "CVE-2026-73502",
        "datePublished": "2026-08-18T17:58:21.320Z",
        "dateReserved": "2026-08-12T19:00:33.736Z",
        "dateUpdated": "2026-08-18T18:42:16.744Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON

Loading timeline…




    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.