---
title: "CVE-2026-91771: Weights & Biases wandb - Path Traversal"
description: "Weights & Biases wandb < 0.29.0 contains a path traversal caused by improper validation of file names in File.download function, letting attackers controlling the backend write files outside intended directories, exploit requires attacker control of backend."
url: https://panop.io/threat-heartbeat/CVE-2026-91771/
---

# CVE-2026-91771 Weights & Biases wandb - Path Traversal

Weights & Biases wandb < 0.29.0 contains a path traversal caused by improper validation of file names in File.download function, letting attackers controlling the backend write files outside intended directories, exploit requires attacker control of backend.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

1.17% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-91771)

## Details

Type

Path Traversal

Impact

File System Write, Remote Code Execution

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Published

15 September 2026

Updated

15 October 2026

Weakness

[CWE-22](https://cwe.mitre.org/data/definitions/22.html)

## Vendor fix

Update to version 0.29.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-91771](https://nvd.nist.gov/vuln/detail/CVE-2026-91771)
- [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)
- [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)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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