Vulnerability · Published Apr 1, 2026 · Assigned by GitHub_M
CVE-2026-34447ONNX: External Data Symlink Traversal
Medium 5.5
In plain English
A medium-severity path traversal in onnx from onnx. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)5.5Medium
Exploit odds (30 days)0.3%top 82.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | onnx | no fix listed | DEBIAN-CVE-2026-34447 |
| Debian:13 | onnx | no fix listed | DEBIAN-CVE-2026-34447 |
| Debian:14 | onnx | no fix listed | DEBIAN-CVE-2026-34447 |
| PyPI | onnx | 1.21.0 | GHSA-p433-9wv8-28xj |
| PyPI | onnx | 1.21.0 | PYSEC-2026-104 |
| Ubuntu:22.04:LTS | onnx | no fix listed | UBUNTU-CVE-2026-34447 |
| Ubuntu:25.10 | onnx | no fix listed | UBUNTU-CVE-2026-34447 |
| Ubuntu:26.04:LTS | onnx | no fix listed | UBUNTU-CVE-2026-34447 |
| Ubuntu:26.10 | onnx | no fix listed | UBUNTU-CVE-2026-34447 |
Affected products (as reported)
Weakness: CWE-61, CWE-22 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
References
- https://github.com/onnx/onnx/security/advisories/GHSA-p433-9wv8-28xj x_refsource_CONFIRM