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Vulnerability · Published Apr 1, 2026 · Assigned by GitHub_M

CVE-2026-27489ONNX: Path Traversal via Symlink

High 8.6

In plain English

A high-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 0.6% (higher than 50% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.6High
Exploit odds (30 days)0.6%top 50.3% 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, 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12onnxno fix listedDEBIAN-CVE-2026-27489
Debian:13onnxno fix listedDEBIAN-CVE-2026-27489
Debian:14onnxno fix listedDEBIAN-CVE-2026-27489
PyPIonnx1.21.0GHSA-3r9x-f23j-gc73
PyPIonnx1.21.0PYSEC-2026-2239
Ubuntu:22.04:LTSonnxno fix listedUBUNTU-CVE-2026-27489
Ubuntu:25.10onnxno fix listedUBUNTU-CVE-2026-27489
Ubuntu:26.04:LTSonnxno fix listedUBUNTU-CVE-2026-27489
Ubuntu:26.10onnxno fix listedUBUNTU-CVE-2026-27489

Affected products (as reported)

VendorProductVersions
onnx onnx < 1.21.0

Weakness: CWE-23, CWE-61, CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

References