CVE-2026-34446 — Path Traversal in Onnx

CWE-22 — Path TraversalCWE-61 — UNIX Symbolic Link (Symlink) FollowingCWE-41 — Improper Resolution of Path Equivalence9 documents7 sources
Severity
4.7MEDIUMNVD
EPSS
0.0%
top 98.89%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
4
OnnxDebian OnnxMsrc Azl3 Pytorch 2.2.2-12 ON Azure Linux 3.0+1 more
Timeline
PublishedApr 1
Latest updateApr 2

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.

CVSS vector

CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:NExploitability: 1.0 | Impact: 3.6

Affected Packages5 packages

▶CVEListV5onnx/onnx< 1.21.0
▶PyPIonnx/onnx< 1.21.0
▶debiandebian/onnx

🔴Vulnerability Details

4
OSV
CVE-2026-34446: (Open Neural Network Exchange (ONNX) is an open standard for machine le↗2026-04-02
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OSV
CVE-2026-34446: Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability↗2026-04-01
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OSV
ONNX: Arbitrary File Read via ExternalData Hardlink Bypass in ONNX load↗2026-04-01
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GHSA
ONNX: Arbitrary File Read via ExternalData Hardlink Bypass in ONNX load↗2026-04-01
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📋Vendor Advisories

3
Microsoft
ONNX: Arbitrary File Read via ExternalData Hardlink Bypass in ONNX load↗2026-04-02
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Red Hat
onnx: ONNX: Information disclosure through hardlink path traversal↗2026-04-01
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Debian
CVE-2026-34446: onnx - Open Neural Network Exchange (ONNX) is an open standard for machine learning int...↗2026
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🕵️Threat Intelligence

1
Wiz
CVE-2026-34446 Impact, Exploitability, and Mitigation Steps | Wiz↗
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