CVE-2026-34446ONNX: Arbitrary File Read via ExternalData Hardlink Bypass in ONNX load

Descripción

Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability. Prior to version 1.21.0, there is an issue in onnx.load, the code checks for symlinks to prevent path traversal, but completely misses hardlinks because a hardlink looks exactly like a regular file on the filesystem. This issue has been patched in version 1.21.0.

Datos: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Se publican tal como los indican las fuentes, en inglés.

Productos y versiones afectados

Referencias y parches

• https://github.com/onnx/onnx/security/advisories/GHSA-cmw6-hcpp-c6jp Vendor Advisory
• https://github.com/onnx/onnx/commit/4755f8053928dce18a61db8fec71b69c74f786cb Patch