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CVE-2026-34445 affects ONNX versions before 1.21.0. The ExternalDataInfo class uses Python’s setattr() function to assign metadata from ONNX model files, including file paths and data lengths, without validating the supplied keys. A maliciously crafted model can therefore overwrite internal object properties instead of being restricted to legitimate metadata attributes. The issue is fixed in ONNX 1.21.0.
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A vulnerability in ONNX's ExternalDataInfo metadata handling allows a crafted model to overwrite internal object properties through unvalidated use of Python's setattr(). The reference assigns a CVSS v3 base score of 8.6, with high availability impact and low confidentiality and integrity impacts. It identifies upstream version 1.21.0 as patched and recommends Echo package version 1.17.0-3+e1 or later.
A vulnerability in ONNX ExternalDataInfo prior to version 1.21.0 where unvalidated metadata keys from a model file are passed to Python setattr(), allowing a malicious model to overwrite internal object properties and potentially impact integrity and availability.
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Cross-references every affected SKU, including bundled OEM variants.
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