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CVE-2026-91771 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:8.8 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/wandb/wandb	[email protected]
https://github.com/wandb/wandb/blob/v0.27.2/wandb/apis/public/files.py#L319-L347	[email protected]
https://github.com/wandb/wandb/commit/e52558f3a6a94ea816af74969a13a35e5904cad6	[email protected]
https://github.com/wandb/wandb/issues/12592	[email protected]
https://github.com/wandb/wandb/releases/tag/v0.29.0	[email protected]
https://www.vulncheck.com/advisories/weights-biases-wandb-before-0.29.0-path-traversal-via-file-download	[email protected]

see all 6 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-22	Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')	[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

Date	Action	Recorded By
Sep 18, 2026	CVE Modified	CISA-ADP
Sep 15, 2026	New CVE Received	[email protected]