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CVE-2026-91771

8.8 · HIGH

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.

Published Sep 15, 2026CWE-22EPSS 1.17%

Overview

CVE-2026-91771 is a high-severity vulnerability. It was published on September 15, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/wandb/wandbGitHubgithub.com/wandb/wandb/blob/v0.27.2/wandb/apis/public/files.py#L319-L347GitHubgithub.com/wandb/wandb/commit/e52558f3a6a94ea816af74969a13a35e5904cad6GitHubgithub.com/wandb/wandb/issues/12592GitHubgithub.com/wandb/wandb/releases/tag/v0.29.0Refwww.vulncheck.com/advisories/weights-biases-wandb-before-0.29.0-path-traversal-via-file-download

How CyberStrike helps

Frequently asked questions

What is CVE-2026-91771?

CVE-2026-91771 is a high-severity vulnerability. It was published on September 15, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-91771?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-91771?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-91771?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-91771 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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