Vulnerability Details CVE-2026-49114
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 5.6%
CVSS Severity
CVSS v3 Score 7.1
References
Products affected by CVE-2026-49114
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cpe:2.3:a:linuxfoundation:onnx:-
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cpe:2.3:a:linuxfoundation:onnx:0.1
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cpe:2.3:a:linuxfoundation:onnx:0.2
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cpe:2.3:a:linuxfoundation:onnx:1.0
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cpe:2.3:a:linuxfoundation:onnx:1.0.1
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cpe:2.3:a:linuxfoundation:onnx:1.1.0
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cpe:2.3:a:linuxfoundation:onnx:1.1.2
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cpe:2.3:a:linuxfoundation:onnx:1.10.0
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cpe:2.3:a:linuxfoundation:onnx:1.10.1
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cpe:2.3:a:linuxfoundation:onnx:1.10.2
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cpe:2.3:a:linuxfoundation:onnx:1.11.0
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cpe:2.3:a:linuxfoundation:onnx:1.12.0
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cpe:2.3:a:linuxfoundation:onnx:1.13.0
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cpe:2.3:a:linuxfoundation:onnx:1.16.0
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cpe:2.3:a:linuxfoundation:onnx:1.16.1
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cpe:2.3:a:linuxfoundation:onnx:1.16.2
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cpe:2.3:a:linuxfoundation:onnx:1.17.0
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cpe:2.3:a:linuxfoundation:onnx:1.18.0
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cpe:2.3:a:linuxfoundation:onnx:1.19.0
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cpe:2.3:a:linuxfoundation:onnx:1.19.1
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cpe:2.3:a:linuxfoundation:onnx:1.2.1
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cpe:2.3:a:linuxfoundation:onnx:1.2.2
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cpe:2.3:a:linuxfoundation:onnx:1.2.3
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cpe:2.3:a:linuxfoundation:onnx:1.20.0
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cpe:2.3:a:linuxfoundation:onnx:1.20.1
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cpe:2.3:a:linuxfoundation:onnx:1.3.0
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cpe:2.3:a:linuxfoundation:onnx:1.4.0
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cpe:2.3:a:linuxfoundation:onnx:1.4.1
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cpe:2.3:a:linuxfoundation:onnx:1.5.0
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cpe:2.3:a:linuxfoundation:onnx:1.6.0
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cpe:2.3:a:linuxfoundation:onnx:1.7.0
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cpe:2.3:a:linuxfoundation:onnx:1.8.0
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cpe:2.3:a:linuxfoundation:onnx:1.8.1
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cpe:2.3:a:linuxfoundation:onnx:1.9.0