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

> CVE-2026-91771: Weights & Biases wandb before 0.29.0 Path Traversal via File Download. CVSS 8.8 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-91771
Last updated: 2026-09-24T21:08:22Z

- Published: 2026-09-15 01:20 UTC · Updated: 2026-09-24 21:08 UTC · Assigner: VulnCheck
- CVSS: 8.8 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS: 1.2%, 67th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: 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 vendors and products

- wandb: wandb

## Tracked companies

- [Weights & Biases](https://rewindex.com/company/weights-biases.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-91771)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-91771)
- [https://github.com/wandb/wandb](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/blob/v0.27.2/wandb/apis/public/files.py#L319-L347)
- [https://github.com/wandb/wandb/commit/e52558f3a6a94ea816af74969a13a35e5904cad6](https://github.com/wandb/wandb/commit/e52558f3a6a94ea816af74969a13a35e5904cad6)
- [https://github.com/wandb/wandb/issues/12592](https://github.com/wandb/wandb/issues/12592)
- [https://github.com/wandb/wandb/releases/tag/v0.29.0](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](https://www.vulncheck.com/advisories/weights-biases-wandb-before-0.29.0-path-traversal-via-file-download)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-91771 · Markdown: https://rewindex.com/cve/CVE-2026-91771.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-91771 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:10:49.324Z