{"cve":"CVE-2026-34445","nvd":{"published":"2026-04-01T18:16:30.500","modified":"2026-06-17T10:39:03.680","status":"Analyzed","description":"Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability. Prior to version 1.21.0, the ExternalDataInfo class in ONNX was using Python’s setattr() function to load metadata (like file paths or data lengths) directly from an ONNX model file. It didn’t check if the \"keys\" in the file were valid. Due to this, an attacker could craft a malicious model that overwrites internal object properties. This issue has been patched in version 1.21.0.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H","score":8.6},"cwes":["CWE-20","CWE-400","CWE-915"],"references":["https://github.com/onnx/onnx/commit/e30c6935d67cc3eca2fa284e37248e7c0036c46b","https://github.com/onnx/onnx/pull/7751","https://github.com/onnx/onnx/security/advisories/GHSA-538c-55jv-c5g9"],"products":["linuxfoundation:onnx"],"source":"nvd","synced_at":"2026-10-19T22:28:18.033120106+00:00"},"epss":{"cve":"CVE-2026-34445","score":0.00292,"percentile":0.21821,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-538c-55jv-c5g9","url":"https://osv.dev/vulnerability/GHSA-538c-55jv-c5g9","summary":"ONNX: Malicious ONNX models can crash servers by exploiting unprotected object settings.","modified":"2026-09-10T03:50:42.953592147Z","packages":[{"ecosystem":"PyPI","name":"onnx","purl":"pkg:pypi/onnx","ranges":["<1.21.0"],"fixed":["1.21.0"]}]},{"id":"PYSEC-2026-2240","url":"https://osv.dev/vulnerability/PYSEC-2026-2240","summary":"","modified":"2026-07-13T07:15:50.515830165Z","packages":[{"ecosystem":"PyPI","name":"onnx","purl":"pkg:pypi/onnx","ranges":["<1.21.0"],"fixed":["1.21.0"]}]}],"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."]}