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Vulnerability record · CVE-2026-91771 · published 15 September 2026

CVE-2026-91771: Path traversal vulnerability

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.

8.7 CVSS 4.0 High EPSS 1.2% · top 33.9% CWE-22 · Path traversal Awaiting Analysis
8.7CVSS 4.0 base score
1.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
6References
24 Sep 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2026-91771), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.