{"id":"CVE-2026-115921","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-115921","generatedAt":"2026-10-28T07:03:28.568Z","title":"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.","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.","published":"2026-10-26T18:17:40.000Z","lastModified":"2026-10-26T18:34:17.000Z","status":"Awaiting Analysis","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":6.2,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-195","CWE-476"],"affected":[],"epss":{"score":0.00131,"percentile":0.02674,"date":"2026-10-27","history":[{"date":"2026-10-27","score":0.00131,"percentile":0.02674}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.13%). Track it; it rarely justifies an emergency change on its own."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-26T18:17:40.000Z","detail":{"score":"6.2","severity":"MEDIUM","publishedAt":"2026-10-26T18:17:39.990Z"},"summary":"New CVE, medium severity (CVSS 6.2)."}],"references":[{"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","source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-115921","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}