CVE-2026-115922

Full vulnerability record from the local CVENow database.

Description

Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability. Prior to 1.22.0, _unpack_2bit() and _unpack_4bit() resize unpacked arrays according to attacker-controlled TensorProto.dims without verifying that raw_data or int32_data encodes the declared number of elements. Materializing an untrusted UINT2, INT2, UINT4, INT4, or FLOAT4E2M1 tensor through onnx.numpy_helper.to_array() or onnx.reference.ReferenceEvaluator can therefore expand a small packed payload into a disproportionately large allocation and exhaust memory. This issue is fixed in version 1.22.0.

Severity

MEDIUM

CVSS score

6.2 (v3.1)

Vulnerability status

Awaiting Analysis

Source identifier

[email protected]

Published

2026-10-26 18:17:40.163000

Last modified

2026-10-26 18:34:17.050000

View original CVE JSON

{
  "id": "CVE-2026-115922",
  "sourceIdentifier": "[email protected]",
  "published": "2026-10-26T18:17:40.163",
  "lastModified": "2026-10-26T18:34:17.050",
  "vulnStatus": "Awaiting Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability. Prior to 1.22.0, _unpack_2bit() and _unpack_4bit() resize unpacked arrays according to attacker-controlled TensorProto.dims without verifying that raw_data or int32_data encodes the declared number of elements. Materializing an untrusted UINT2, INT2, UINT4, INT4, or FLOAT4E2M1 tensor through onnx.numpy_helper.to_array() or onnx.reference.ReferenceEvaluator can therefore expand a small packed payload into a disproportionately large allocation and exhaust memory. This issue is fixed in version 1.22.0."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "onnx",
          "product": "onnx",
          "versions": [
            {
              "version": "< 1.22.0",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "baseScore": 6.2,
          "baseSeverity": "MEDIUM",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 2.5,
        "impactScore": 3.6
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Primary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-789"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/onnx/onnx/commit/05c1bc3bceceb8d3cf11e9e7fc7f19f971c44988",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/onnx/onnx/commit/8de2cf6aa47928e6515ac6d9e1a8b4758886a7df",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/onnx/onnx/commit/dce5876d6cc6cc30157af7d26a752ef44976da8e",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/onnx/onnx/pull/8033",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/onnx/onnx/pull/8038",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/onnx/onnx/pull/8066",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/onnx/onnx/releases/tag/v1.22.0",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/onnx/onnx/security/advisories/GHSA-q69g-f4f5-v8m7",
      "source": "[email protected]"
    }
  ]
}