CVE-2026-115921 (GCVE-0-2026-115921)

Vulnerability from cvelistv5 – Published: 2026-10-26 17:28 – Updated: 2026-10-26 17:28
VLAI
Title
ONNX: Null Pointer Dereference in ScanInferenceFunction Due to Missing Required Attribute
Summary
Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability. From 1.4.0 until 1.22.0, ScanInferenceFunction, ScanInferenceFunction_opset8, and ScanInferenceFunction_opset9 do not safely validate the required num_scan_inputs attribute. A missing attribute is dereferenced as a null pointer, while a negative value is converted to size_t and can reach an exceptional oversized allocation path. An untrusted model can therefore terminate or disrupt shape inference, including a negative-value model that can pass onnx.checker.check_model(). This issue is fixed in version 1.22.0.
Severity
6.2 (Medium)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-195 - Signed to Unsigned Conversion Error
  • CWE-476 - NULL Pointer Dereference
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7797 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
onnx onnx Affected: >= 1.4.0, < 1.22.0
guessed Create a notification for this product.
Show details on NVD website
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          "value": "Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability. From 1.4.0 until 1.22.0, ScanInferenceFunction, ScanInferenceFunction_opset8, and ScanInferenceFunction_opset9 do not safely validate the required num_scan_inputs attribute. A missing attribute is dereferenced as a null pointer, while a negative value is converted to size_t and can reach an exceptional oversized allocation path. An untrusted model can therefore terminate or disrupt shape inference, including a negative-value model that can pass onnx.checker.check_model(). This issue is fixed in version 1.22.0."
        }
      ],
      "metrics": [
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            "baseScore": 6.2,
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            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
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            "userInteraction": "NONE",
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              "description": "CWE-195: Signed to Unsigned Conversion Error",
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              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
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              "description": "CWE-476: NULL Pointer Dereference",
              "lang": "en",
              "type": "CWE"
            }
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-26T17:28:41.420Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
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          "name": "https://github.com/onnx/onnx/security/advisories/GHSA-m4pr-6v3c-6fgr",
          "tags": [
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          "url": "https://github.com/onnx/onnx/security/advisories/GHSA-m4pr-6v3c-6fgr"
        },
        {
          "name": "https://github.com/onnx/onnx/pull/7916",
          "tags": [
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          "url": "https://github.com/onnx/onnx/pull/7916"
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          "name": "https://github.com/onnx/onnx/commit/dd6bc92ea39fd2274fd671f0734b0b8b558356f5",
          "tags": [
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          "url": "https://github.com/onnx/onnx/commit/dd6bc92ea39fd2274fd671f0734b0b8b558356f5"
        },
        {
          "name": "https://github.com/onnx/onnx/releases/tag/v1.22.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/onnx/onnx/releases/tag/v1.22.0"
        }
      ],
      "source": {
        "advisory": "GHSA-m4pr-6v3c-6fgr",
        "discovery": "UNKNOWN"
      },
      "title": "ONNX: Null Pointer Dereference in ScanInferenceFunction Due to Missing Required Attribute"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-115921",
    "datePublished": "2026-10-26T17:28:41.420Z",
    "dateReserved": "2026-10-23T20:21:45.107Z",
    "dateUpdated": "2026-10-26T17:28:41.420Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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              {
                "product": "onnx",
                "vendor": "onnx",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003e= 1.4.0, \u003c 1.22.0"
                  }
                ]
              }
            ],
            "source": "security-advisories@github.com"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability. From 1.4.0 until 1.22.0, ScanInferenceFunction, ScanInferenceFunction_opset8, and ScanInferenceFunction_opset9 do not safely validate the required num_scan_inputs attribute. A missing attribute is dereferenced as a null pointer, while a negative value is converted to size_t and can reach an exceptional oversized allocation path. An untrusted model can therefore terminate or disrupt shape inference, including a negative-value model that can pass onnx.checker.check_model(). This issue is fixed in version 1.22.0."
          }
        ],
        "id": "CVE-2026-115921",
        "lastModified": "2026-10-26T18:34:17.050",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 6.2,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
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              "impactScore": 3.6,
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              "type": "Secondary"
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        },
        "published": "2026-10-26T18:17:39.990",
        "references": [
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/onnx/onnx/commit/dd6bc92ea39fd2274fd671f0734b0b8b558356f5"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/onnx/onnx/pull/7916"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/onnx/onnx/releases/tag/v1.22.0"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/onnx/onnx/security/advisories/GHSA-m4pr-6v3c-6fgr"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Awaiting Analysis",
        "weaknesses": [
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              {
                "lang": "en",
                "value": "CWE-195"
              },
              {
                "lang": "en",
                "value": "CWE-476"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Primary"
          }
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    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-27T04:17:35+00:00",
      "cve": "CVE-2026-115921",
      "id": "CVE-2026-115921",
      "initial_release_date": "2026-10-26T17:28:41.420000+00:00",
      "product_status:known_affected": "17",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "onnx: onnx: Denial of Service via improper attribute validation in Scan shape inference",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-115921.json",
      "version": "3"
    }
  }
}



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