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CVE-2026-49114

6.8 medium SSVC exploitation: poc Analyzed
NVD · CVE.org

In ONNX before 1.21.0, the 'save_external_data' function builds the external-data file path from the model's external_data location field and opens it for writing without 'O_NOFOLLOW/O_EXCL', after a non-atomic 'os.path.isfile()' check. A local attacker with write access to the directory where a victim serializes external data can deterministically pre-plant a symlink that is being followed, causing the victim's write to append to any file the victim can write, e.g. ~/.ssh/authorized_keys, cron files, or application configs. Fixed in 1.21.0.

Fix

Patch, vendor advisory and mitigation references on NVD 1

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 6.8 · linuxfoundationNVD modified 2026-10-15 19:10

Affected (CPE criteria) 1

  • cpe:2.3:a:linuxfoundation:onnx:*:*:*:*:*:*:*:*

References 3