high8.6
CVE-2026-34445
Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability.
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | onnx | <= 1.20.1 | 1.21.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Linuxfoundation | Onnx | before 1.21.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-538c-55jv-c5g9
- https://github.com/onnx/onnx/security/advisories/GHSA-538c-55jv-c5g9
- https://nvd.nist.gov/vuln/detail/CVE-2026-34445
- https://github.com/onnx/onnx/pull/7751
- https://github.com/onnx/onnx/commit/e30c6935d67cc3eca2fa284e37248e7c0036c46b