Vulnerability · Published Sep 15, 2026 · Assigned by VulnCheck

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

High 8.8

In plain English

A high-severity path traversal in wandb from wandb. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.2% (higher than 67% of all known vulnerabilities).

Severity (CVSS 3.1)8.8High

Exploit odds (30 days)1.2%top 32.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
wandb	wandb	0 – before 0.29.0

Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References

https://github.com/wandb/wandb/issues/12592 issue-tracking
https://github.com/wandb/wandb/commit/e52558f3a6a94ea816af74969a13a35e5904cad6 patch
wandb v0.29.0 Release Notes release-notes
https://github.com/wandb/wandb/blob/v0.27.2/wandb/apis/public/files.py#L319-L347 technical-description
https://github.com/wandb/wandb product
VulnCheck Advisory: Weights & Biases wandb before 0.29.0 Path Traversal via File Download third-party-advisory