Link following in onnx - CVE-2026-34447
Published: April 27, 2026
Vulnerability identifier: #VU128174
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-34447
CWE-ID: CWE-59
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to improper link resolution in resolve_external_data_location in onnx/onnx/checker.cc when loading external data for a model from a directory containing a crafted symlink. A remote attacker can place a symlink inside the model directory that points to a file outside the model directory to disclose sensitive information.
User interaction is required to load a crafted model.
Affected software
onnx
How to mitigate CVE-2026-34447
Install security update from vendor's website.
onnx - update to 1.21.0