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CVE-2026-49114

7.1 HIGHPublic exploitEPSS 0.11%
  1. Published21 Aug 2026

Description

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 victim can write, e.g. ~/.ssh/authorized_keys, cron files, or application configs. Fixed in 1.21.0.

CVSS 3.1 breakdown

Attack vectorLocal
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeUnchanged
ConfidentialityNone
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H

Affected products

Linuxfoundation Onnx< 1.21.0

Remediation

Fixed in
Linuxfoundation Onnx≥ 1.21.0

References

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Frequently asked

Is CVE-2026-49114 being actively exploited?

CVE-2026-49114 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.11%.

How severe is CVE-2026-49114?

CVE-2026-49114 has a CVSS 3.1 base score of 7.1, rated high. EPSS estimates a 0.11% probability of exploitation.

Which products are affected by CVE-2026-49114?

Affected products include Linuxfoundation Onnx.

How do I fix CVE-2026-49114?

Upgrade affected software to a fixed version, for example Linuxfoundation Onnx 1.21.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-49114 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.