Path Traversal in Linuxfoundation Onnx
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.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H.
EPSS exploit prediction
EPSS: 0.002 (4.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 4th percentile — 4.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.002 · change: +0.001
Affected products
Weakness classification (CWE)
References
- 9119a7d8-5eab-497f-8521-727c672e3725 (Exploit, vendor-advisory, exploit, Vendor Advisory)
- 9119a7d8-5eab-497f-8521-727c672e3725 (VDB Entry, third-party-advisory)
- 9119a7d8-5eab-497f-8521-727c672e3725 (VDB Entry, Third Party Advisory, vdb-entry)
Frequently asked questions
- What is CVE-2026-49114?
- CVE-2026-49114 is a high-severity vulnerability in Linuxfoundation Onnx, classified under Path Traversal. CVSS score: 7.1/10. Published 2026-08-21.
- How severe is CVE-2026-49114?
- High severity. CVSS v3 base score is 7.1 out of 10.