CVE-2026-49114ONNX symlink-following and path-traversal arbitrary file write
Updated under an hour ago ()
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It affects ONNX and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.1 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
- Weakness (CWE)
- CWE-367, CWE-22, CWE-59
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- cisa-cg
- NVD analysis
- Analyzed
- Record last updated
- Aug 21, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
ONNX ONNX onnx:onnx (from the name) | before 1.21.0; 1.21.0 not affected | CNA record |
linuxfoundation onnx linuxfoundation:onnx | before 1.21.0 | NVD |
References
- https://github.com/onnx/onnx/security/advisories/GHSA-q56x-g2fj-4rj6vendor-advisory, exploit
- https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-233-01.jsonthird-party-advisory, vdb-entry
- https://www.cve.org/CVERecord?id=CVE-2026-49114vdb-entry, third-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.