Signed to Unsigned Conversion Error Affecting onnx package, versions [1.4.0,1.22.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-ONNX-21755377
- published27 Oct 2026
- disclosed26 Oct 2026
- creditMinicoAI
Introduced: 26 Oct 2026
NewCVE-2026-115921 (opens in a new tab)How to fix?
Upgrade onnx to version 1.22.0 or higher.
Overview
onnx is an Open Neural Network Exchange
Affected versions of this package are vulnerable to Signed to Unsigned Conversion Error via the shape inference functions in onnx/defs/controlflow/utils.cc, onnx/defs/controlflow/old.cc, and onnx/defs/nn/defs.cc, where ctx.getAttribute() can return a null pointer that is immediately dereferenced without a null check. An attacker can supply an ONNX model that omits required attributes (such as num_scan_inputs for Scan nodes or a mismatched weight rank for ConvTranspose nodes) to trigger a null pointer dereference during shape inference, crashing the process.