GHSA-486P-G8X4-77MG: onnx PyPI
Vulnerability summary
GHSA-486P-G8X4-77MG is a medium (CVSS 6.8) vulnerability in onnx PyPI.
Advisory lineage
Upstream 0 · Downstream 1Timeline
- 21-08-2026PublishedVulnerability first disclosed.
- 08-09-2026Last modifiedVulnerability information updated.
Description
Duplicate Advisory: ONNX: TOCTOU arbitrary file read/write in save_external_dat ## Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-q56x-g2fj-4rj6. This link is maintained to preserve external references. ## Original 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.
CVSS metrics
2 scores · 1 source · 2 versionsEPSS trend
No EPSS score has been published for this record yet.
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
PyPI1 product
- onnx≤ 1.20.1
1 vendor · 1 product
