CVE-2026-34446: Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability

Q: How do I fix CVE-2026-34446?

onnx: upgrade to 1.21.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-34446 being exploited?

CVE-2026-34446 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-34446 affect?

CVE-2026-34446 affects onnx. Severity is medium (CVSS 4.7). 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

Q: How urgent is CVE-2026-34446?

Priority 23/100. On your watchlist

Routine

MEDIUM 4.7WATCHLISTUPGRADE

CVE-2026-34446 is a medium-severity flaw (CVSS 4.7) affecting onnx. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	4.7 (Medium)
Attack vector	Local
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 93%)
CISA exploited list	No
Weakness	CWE-22, CWE-61
Published	2026-04-01
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: linuxfoundation

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-01 18:16 UTCPublished CVE record published
2026-06-17 10:39 UTCUpdated Record last modified

linuxfoundation onnx UPGRADE

Affected: < 1.21.0

Fixed in: 1.21.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy onnx || rpm -q onnx || onnx --version

2. UPGRADE to 1.21.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade onnx

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade onnx

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-34446?

onnx: upgrade to 1.21.0. Exact commands for each OS are on this page.

Is CVE-2026-34446 being exploited?

CVE-2026-34446 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-34446 affect?

CVE-2026-34446 affects onnx. Severity is medium (CVSS 4.7). 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

How urgent is CVE-2026-34446?

Priority 23/100. On your watchlist

Related CVEs

CVE-2026-49114 HIGH 7.1 UPGRADE In ONNX before 1.21.0, the 'save_external_data' function builds the external-data file path from the model's e
CVE-2026-28500 HIGH 8.6 UPGRADE Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability
CVE-2026-27489 HIGH 7.5 UPGRADE Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability
CVE-2026-44512 MEDIUM 5.5 UPGRADE Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability
CVE-2026-34447 MEDIUM 5.5 UPGRADE Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability

References

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