{"id":"CVE-2026-115921","state":"PUBLISHED","title":"ONNX: Null Pointer Dereference in ScanInferenceFunction Due to Missing Required Attribute","description":"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.","publishedAt":"2026-10-26T17:28:41.420Z","updatedAt":"2026-10-31T01:40:08.161Z","severity":{"score":6.2,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["onnx onnx"],"affected":[{"vendor":"onnx","product":"onnx","versions":[{"version":">= 1.4.0, < 1.22.0","status":"affected"}]}],"references":["https://github.com/onnx/onnx/security/advisories/GHSA-m4pr-6v3c-6fgr","https://github.com/onnx/onnx/pull/7916","https://github.com/onnx/onnx/commit/dd6bc92ea39fd2274fd671f0734b0b8b558356f5","https://github.com/onnx/onnx/releases/tag/v1.22.0"],"weaknesses":["CWE-195","CWE-476"],"ingestedAt":"2026-10-31T01:48:06.172Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/115xxx/CVE-2026-115921.json","commit":"0fb23ba5b8d5f317fc043d36c085d466e7facb9f","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-115921","state":"PUBLISHED","datePublished":"2026-10-26T17:28:41.420Z","dateUpdated":"2026-10-31T01:40:08.161Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-10-23T20:21:45.107Z"},"containers":{"cna":{"title":"ONNX: Null Pointer Dereference in ScanInferenceFunction Due to Missing Required Attribute","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."}],"affected":[{"vendor":"onnx","product":"onnx","versions":[{"version":">= 1.4.0, < 1.22.0","status":"affected"}]}],"references":[{"url":"https://github.com/onnx/onnx/security/advisories/GHSA-m4pr-6v3c-6fgr","name":"https://github.com/onnx/onnx/security/advisories/GHSA-m4pr-6v3c-6fgr","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/onnx/onnx/pull/7916","name":"https://github.com/onnx/onnx/pull/7916","tags":["x_refsource_MISC"]},{"url":"https://github.com/onnx/onnx/commit/dd6bc92ea39fd2274fd671f0734b0b8b558356f5","name":"https://github.com/onnx/onnx/commit/dd6bc92ea39fd2274fd671f0734b0b8b558356f5","tags":["x_refsource_MISC"]},{"url":"https://github.com/onnx/onnx/releases/tag/v1.22.0","name":"https://github.com/onnx/onnx/releases/tag/v1.22.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-195","lang":"en","description":"CWE-195: Signed to Unsigned Conversion Error","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-476","lang":"en","description":"CWE-476: NULL Pointer Dereference","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-10-26T17:28:41.420Z"},"source":{"advisory":"GHSA-m4pr-6v3c-6fgr","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-31T01:39:56.289903Z","id":"CVE-2026-115921","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-31T01:40:08.161Z"}}]}}}