CVE-2026-34446

MEDIUM

ONNX: Arbitrary File Read via ExternalData Hardlink Bypass in ONNX load

Title source: cna
STIX 2.1

Description

Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability. Prior to version 1.21.0, there is an issue in onnx.load, the code checks for symlinks to prevent path traversal, but completely misses hardlinks because a hardlink looks exactly like a regular file on the filesystem. This issue has been patched in version 1.21.0.

References (2)

Core 2

Scores

CVSS v3 4.7
EPSS 0.0018
EPSS Percentile 7.3%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-22 CWE-61
Status published
Products (3)
linuxfoundation/onnx < 1.21.0
onnx/onnx < 1.21.0
pypi/onnx 0 - 1.21.0PyPI
Published Apr 01, 2026
Tracked Since Apr 01, 2026