UNIX symbolic link following in onnx - CVE-2026-27489
Published: April 27, 2026
Vulnerability identifier: #VU128173
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-27489
CWE-ID: CWE-61
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 symlink following in external data loading in onnx/checker.cc when loading a model with external data files. A remote attacker can provide a crafted model package containing a symlinked external data file to disclose sensitive information.
The issue can expose arbitrary files outside the model or user-provided directory, and is not limited to UNIX environments.
Affected software
onnx
How to mitigate CVE-2026-27489
Install security update from vendor's website.
onnx - update to 1.21.0