{"id":"CVE-2026-115922","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-115922","generatedAt":"2026-10-28T01:53:32.141Z","title":"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.","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.","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-789"],"affected":[],"epss":null,"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 no EPSS score yet. 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":"2026-10-26T18:17:40.163Z"},"summary":"New CVE, medium severity (CVSS 6.2)."}],"references":[{"url":"https://github.com/onnx/onnx/commit/05c1bc3bceceb8d3cf11e9e7fc7f19f971c44988","source":"security-advisories@github.com"},{"url":"https://github.com/onnx/onnx/commit/8de2cf6aa47928e6515ac6d9e1a8b4758886a7df","source":"security-advisories@github.com"},{"url":"https://github.com/onnx/onnx/commit/dce5876d6cc6cc30157af7d26a752ef44976da8e","source":"security-advisories@github.com"},{"url":"https://github.com/onnx/onnx/pull/8033","source":"security-advisories@github.com"},{"url":"https://github.com/onnx/onnx/pull/8038","source":"security-advisories@github.com"},{"url":"https://github.com/onnx/onnx/pull/8066","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-q69g-f4f5-v8m7","source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-115922","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."}