CVE-2026-115922

Name	CVE-2026-115922
Description	Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability. Prior to 1.22.0, _unpack_2bit() and _unpack_4bit() resize unpacked arrays according to attacker-controlled TensorProto.dims without verifying that raw_data or int32_data encodes the declared number of elements. Materializing an untrusted UINT2, INT2, UINT4, INT4, or FLOAT4E2M1 tensor through onnx.numpy_helper.to_array() or onnx.reference.ReferenceEvaluator can therefore expand a small packed payload into a disproportionately large allocation and exhaust memory. This issue is fixed in version 1.22.0.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
onnx (PTS)	bookworm	1.12.0-2	vulnerable
	trixie	1.17.0-3	vulnerable
	forky, sid	1.20.0-6	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
onnx	source	(unstable)	(unfixed)

Notes

https://github.com/onnx/onnx/security/advisories/GHSA-q69g-f4f5-v8m7
https://github.com/onnx/onnx/pull/8033
Fixed by: https://github.com/onnx/onnx/commit/dce5876d6cc6cc30157af7d26a752ef44976da8e (v1.23.0)
https://github.com/onnx/onnx/pull/8038
Fixed by: https://github.com/onnx/onnx/commit/05c1bc3bceceb8d3cf11e9e7fc7f19f971c44988 (v1.23.0)
Fixed by: https://github.com/onnx/onnx/commit/8de2cf6aa47928e6515ac6d9e1a8b4758886a7df (v1.22.0)