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CVE-2026-34447

ONNX: External Data Symlink Traversal

MEDIUM
5.5
CVSS Score
Published: April 1, 2026 at 05:39 PM UTC
Updated: June 17, 2026 at 10:39 AM UTC
2 products affected across 2 vendorsOnnxONNX

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Severity
MEDIUM5.5
Exploit prediction
EPSS 0.2%
SSVC
PoC

Description

Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability. Prior to version 1.21.0, there is a symlink traversal vulnerability in external data loading allows reading files outside the model directory. This issue has been patched in version 1.21.0.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Onnx· Linuxfoundation
95%
v < 1.21.0
ONNX· Onnxpypi
60%
v < 1.21.0
Affected range stops below 1.21.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

x_refsource_CONFIRMExploitVendor Advisory
Source: cverecord
https://github.com/onnx/onnx/security/advisories/GHSA-p433-9wv8-28xj

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.5MEDIUMGitHub_M
Attack Vector
LOCAL
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-61CWE-22

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