CVE-2026-27489

Summary

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 Software

Weaknesses

• CWE-23: CWE-23: Relative Path Traversal
• CWE-61: CWE-61: UNIX Symbolic Link (Symlink) Following

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: yes
  • Technical Impact: partial

onnx: ONNX: Information Disclosure via Path Traversal Vulnerability

Additional References

• https://access.redhat.com/security/cve/CVE-2026-27489
• https://bugzilla.redhat.com/show_bug.cgi?id=2453929
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27489.json
• https://access.redhat.com/errata/RHSA-2026:24977

References

• https://github.com/onnx/onnx/security/advisories/GHSA-3r9x-f23j-gc73
• https://github.com/onnx/onnx/commit/4755f8053928dce18a61db8fec71b69c74f786cb

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