{"cve":"CVE-2026-63632","nvd":{"published":"2026-08-18T15:16:56.463","modified":"2026-09-18T20:05:53.723","status":"Awaiting Analysis","description":"Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability. From 1.3.0 until 1.22.0, onnx.version_converter.convert_version() can perform an out-of-bounds read in Gemm_7_6::adapt_gemm_7_6() in onnx/version_converter/adapters/gemm_7_6.h when a Gemm node has input tensors with fewer than two dimensions because B_shape[1], A_shape[0], or A_shape[1] is accessed without a rank check, potentially causing a process crash during an opset 7 to 6 downgrade. This issue is fixed in version 1.22.0.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L","score":3.3},"cwes":["CWE-125"],"references":["https://github.com/onnx/onnx/commit/e9c74f596eaa0250f89e52a54160a25bbcb25b66","https://github.com/onnx/onnx/pull/7880","https://github.com/onnx/onnx/releases/tag/v1.22.0","https://github.com/onnx/onnx/security/advisories/GHSA-p893-rvq9-2xf9","https://github.com/onnx/onnx/security/advisories/GHSA-p893-rvq9-2xf9"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:49:10.689564601+00:00"},"epss":{"cve":"CVE-2026-63632","score":0.00168,"percentile":0.06012,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-p893-rvq9-2xf9","url":"https://osv.dev/vulnerability/GHSA-p893-rvq9-2xf9","summary":"ONNX: Heap-Buffer-Overflow READ in Gemm Version Converter Adapter via Undersized Input Shape","modified":"2026-08-04T14:41:07.048011214Z","packages":[{"ecosystem":"PyPI","name":"onnx","purl":"pkg:pypi/onnx","ranges":[">=1.3.0 <1.22.0"],"fixed":["1.22.0"]}]},{"id":"PYSEC-2026-3587","url":"https://osv.dev/vulnerability/PYSEC-2026-3587","summary":"ONNX: Heap-Buffer-Overflow READ in Gemm Version Converter Adapter via Undersized Input Shape","modified":"2026-08-04T14:30:27.716013637Z","packages":[{"ecosystem":"PyPI","name":"onnx","purl":"pkg:pypi/onnx","ranges":[">=1.3.0 <1.22.0"],"fixed":["1.22.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}