High severity7.1NVD Advisory· Published Aug 21, 2026· Updated Sep 16, 2026
CVE-2026-49114
CVE-2026-49114
Description
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
onnxPyPI | < 1.21.0 | 1.21.0 |
Affected products
1Patches
Vulnerability mechanics
References
5- github.com/onnx/onnx/security/advisories/GHSA-q56x-g2fj-4rj6nvdExploitVendor AdvisoryWEB
- github.com/advisories/GHSA-q56x-g2fj-4rj6ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-49114ghsaADVISORY
- www.cve.org/CVERecordnvdThird Party AdvisoryVDB Entry
- raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-233-01.jsonnvdVDB EntryWEB
News mentions
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