CVE-2026-27489: Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability

Q: How do I fix CVE-2026-27489?

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

Q: Is CVE-2026-27489 being exploited?

CVE-2026-27489 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-2026-27489 affect?

CVE-2026-27489 affects onnx. Severity is high (CVSS 7.5). Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability. Prior to version 1.21.0, a path traversal vulnerability via symlink allows to read arbitrary files outside model or user-provided directory. This

Q: How urgent is CVE-2026-27489?

Priority 53/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist

This week

HIGH 7.5REMOTEWATCHLISTUPGRADE

CVE-2026-27489 is a high-severity flaw (CVSS 7.5) 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, a path traversal vulnerability via symlink allows to read arbitrary files outside model or user-provided directory. This issue has been patched in version 1.21.0.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 52%)
CISA exploited list	No
Weakness	CWE-23, CWE-61, CWE-22
Published	2026-04-01
Last modified	2026-07-15

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

Last updated 2026-07-15 · 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
2026-07-15 02:19 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-2026-27489?

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

Is CVE-2026-27489 being exploited?

CVE-2026-27489 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-2026-27489 affect?

CVE-2026-27489 affects onnx. Severity is high (CVSS 7.5). Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability. Prior to version 1.21.0, a path traversal vulnerability via symlink allows to read arbitrary files outside model or user-provided directory. This

How urgent is CVE-2026-27489?

Priority 53/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action; 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-2026-44512 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
CVE-2026-34446 MEDIUM 4.7 UPGRADE Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability

References

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