Weights & Biases wandb before 0.29.0 Path Traversal via File Download

Advisories

Weights & Biases wandb before 0.29.0 Path Traversal via File Download

severity: high
date: 9/14/2026
Affecting: wandb >= 0, < 0.29.0
CVE: CVE-2026-91771
CWE: CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CVSS: 8.7
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
References: https://github.com/wandb/wandb/issues/12592
https://github.com/wandb/wandb/commit/e52558f3a6a94ea816af74969a13a35e5904cad6
wandb v0.29.0 Release Notes
https://github.com/wandb/wandb/blob/v0.27.2/wandb/apis/public/files.py#L319-L347
https://github.com/wandb/wandb
Credit: George Chen
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.

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