CVE-2026-91771: high-severity vulnerability in wandb
Weights & Biases wandb before 0.29.0 Path Traversal via File Download
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.7epss 1.2%
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.
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
Affected products
wandb · wandbReferences
https://github.com/wandb/wandbhttps://github.com/wandb/wandb/blob/v0.27.2/wandb/apis/public/files.py#L319-L347https://github.com/wandb/wandb/commit/e52558f3a6a94ea816af74969a13a35e5904cad6https://github.com/wandb/wandb/issues/12592https://github.com/wandb/wandb/releases/tag/v0.29.0https://www.vulncheck.com/advisories/weights-biases-wandb-before-0.29.0-path-traversal-via-file-download