CVE-2026-34446mediumCWE-22CWE-61

CVE-2026-34446: medium-severity vulnerability in onnx

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

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13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 4.7epss 0.2%
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.
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
Affected products
onnx · onnx
Related CVEs — onnx

In the same product, most dangerous first.

CVE-2024-27318HIGHCVE-2024-27318EPSS 1.2%CVE-2026-27489HIGHONNX: Path Traversal via SymlinkEPSS 0.6%CVE-2024-27319MEDIUMCVE-2024-27319EPSS 0.6%CVE-2026-28500HIGHONNX Untrusted Model Repository Warnings Suppressed by silent=True in onnx.hub.load() — Silent Supply-Chain AttackEPSS 0.3%CVE-2026-34445HIGHONNX: Malicious ONNX models can crash servers by exploiting unprotected object settings.EPSS 0.3%CVE-2026-34447MEDIUMONNX: External Data Symlink TraversalEPSS 0.3%