{"id":"CVE-2026-115921","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 requ…","severity":"medium","cvss":6.2,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvssSource":"cna","cwe":["CWE-195","CWE-476"],"vendor":"onnx","product":"onnx","affected":["onnx >= 1.4.0, < 1.22.0"],"published":"2026-10-26","updated":"2026-10-26","sourceUpdated":"2026-10-26T17:28:41.420Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-115921","references":[{"url":"https://github.com/onnx/onnx/security/advisories/GHSA-m4pr-6v3c-6fgr","label":"https://github.com/onnx/onnx/security/advisories/GHSA-m4pr-6v3c-6fgr"},{"url":"https://github.com/onnx/onnx/pull/7916","label":"https://github.com/onnx/onnx/pull/7916"},{"url":"https://github.com/onnx/onnx/commit/dd6bc92ea39fd2274fd671f0734b0b8b558356f5","label":"https://github.com/onnx/onnx/commit/dd6bc92ea39fd2274fd671f0734b0b8b558356f5"},{"url":"https://github.com/onnx/onnx/releases/tag/v1.22.0","label":"https://github.com/onnx/onnx/releases/tag/v1.22.0"}],"tags":["cve.org"],"ingestedAt":"2026-10-26T17:33:33.052Z","slug":"CVE-2026-115921","body":"## Overview\n\nOpen 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.\n\n## Affected\n\n- `onnx >= 1.4.0, < 1.22.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":34,"depthScoreParts":{"impact":34.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}