What’s Vulnerable › Vulnerabilities

CVE-2026-91771: Weights & Biases wandb before 0.29.0 Path Traversal via File Download

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-15 · updated 2026-09-24
• Weakness: CWE-22

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.

Affected products

• wandb: before 0.29.0 — fixed in 0.29.0

How to fix

Upgrade to a fixed version: wandb 0.29.0. Check the vendor advisory for mitigations.

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

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