CVSS 3.1
8.6 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:HCVE-2026-34445
High (8.6) in linuxfoundation onnx. EPSS 0.3% chance of exploitation in the next 30 days. Fixed in onnx 1.21.0.
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.
Severity
- EPSS
- 0.3% chance of exploitation in the next 30 days; higher than 21% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-20, CWE-400, CWE-915
- Published
- Modified
- Record from
- the NVD, synced
Affected
- linuxfoundation:onnx
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-538c-55jv-c5g9 | PyPI | onnx | <1.21.0 | 1.21.0 |
| PYSEC-2026-2240 | PyPI | onnx | <1.21.0 | 1.21.0 |