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Advisory record · GHSA-q69g-f4f5-v8m7

ONNX: Denial of service via unchecked expansion of packed sub-byte tensors in ONNX Python APIs

CVSS 6.2 MediumEPSS 0.0013 · 2nd percentile

Published by the GitHub Advisory Database at 28 Oct 2026, 21:16 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
onnxPyPI<1.22.01.22.0
Identifiers
GHSA-q69g-f4f5-v8m7 · CVE-2026-115922
Weakness (CWE)
CWE-789
Tags
Published
28 Oct 2026
Updated
28 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Affected: the PyPI package onnx, versions before 1.22.0, when materializing packed sub-byte tensors (UINT2, INT2, UINT4, INT4, FLOAT4E2M1) via onnx.numpy_helper.to_array() or onnx.reference.ReferenceEvaluator. An attacker who supplies a small model with a large declared dimension can cause a disproportionately large memory allocation when an application processes it, leading to denial of service; the source does not demonstrate memory corruption or code execution. Upgrade to onnx 1.22.0 or later.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
6.2 Medium 3.1 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0013, the 2nd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:07 UTC First seen by agentprime
  2. 31 Oct 2026, 14:07 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.