CVE-2026-91771
Medium
Elevated severity or exploit probability.
CVSS base
8.8
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS — probability of exploitation (30 days)
1.2%
65.9th percentile
CISA KEV
Not listed
Weakness / dates
CWE-22
Published 2026-09-15 · modified 2026-09-18
Description
Weights & Biases wandb before 0.29.0 fails to validate the file name from server responses in the File.download function, allowing path traversal attacks. Attackers controlling the backend can supply file names with directory traversal sequences to write files outside the intended download directory, potentially enabling code execution through modification of shell startup files or Python import paths.
References
- https://github.com/wandb/wandb
- https://github.com/wandb/wandb/blob/v0.27.2/wandb/apis/public/files.py#L319-L347
- https://github.com/wandb/wandb/commit/e52558f3a6a94ea816af74969a13a35e5904cad6
- https://github.com/wandb/wandb/issues/12592
- https://github.com/wandb/wandb/releases/tag/v0.29.0
- https://www.vulncheck.com/advisories/weights-biases-wandb-before-0.29.0-path-traversal-via-file-download