CVE-2026-49114: In ONNX before 1.21.0, the 'save_external_data' function builds the external-data file path from the model's e

Q: How do I fix CVE-2026-49114?

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

Q: Is CVE-2026-49114 being exploited?

CVE-2026-49114 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-2026-49114 affect?

CVE-2026-49114 affects onnx. Severity is high (CVSS 7.1). In ONNX before 1.21.0, the 'save_external_data' function builds the external-data file path from the model's external_data location field and opens it for writing without 'O_NOFOLLOW/O_EXCL', after a non-atomic 'os.path.isfile()' check. A l

Q: How urgent is CVE-2026-49114?

Priority 36/100. High severity; Public exploit reference; On your watchlist

Routine

HIGH 7.1WATCHLISTUPGRADE

CVE-2026-49114 is a high-severity flaw (CVSS 7.1) affecting onnx. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In ONNX before 1.21.0, the 'save_external_data' function builds the external-data file path from the model's external_data location field and opens it for writing without 'O_NOFOLLOW/O_EXCL', after a non-atomic 'os.path.isfile()' check. A local attacker with write access to the directory where a victim serializes external data can deterministically pre-plant a symlink that is being followed, causing the victim's write to append to any file the vi

Why this priority

High severity
Public exploit reference
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.1 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 95%)
CISA exploited list	No
Weakness	CWE-22, CWE-59, CWE-367
Published	2026-08-21
Last modified	2026-10-15

Publisher (CNA): Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government · Vendor: linuxfoundation

Last updated 2026-10-15 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-21 16:17 UTCPublished CVE record published
2026-10-15 19:10 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-2026-49114?

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

Is CVE-2026-49114 being exploited?

CVE-2026-49114 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-2026-49114 affect?

CVE-2026-49114 affects onnx. Severity is high (CVSS 7.1). In ONNX before 1.21.0, the 'save_external_data' function builds the external-data file path from the model's external_data location field and opens it for writing without 'O_NOFOLLOW/O_EXCL', after a non-atomic 'os.path.isfile()' check. A l

How urgent is CVE-2026-49114?

Priority 36/100. High severity; Public exploit reference; On your watchlist

References

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