CVE-2026-104843: uv: Path traversal on Windows through wheel extraction

Severity: medium (CVSS 5.9 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-02 · updated 2026-10-02
Weakness: CWE-22

Description

uv is a Python package and project manager written in Rust. From 0.12.7 until 0.12.18, uv wheel extraction on Windows can process a malicious wheel in a way that writes a file outside the installation prefix, including an executable in a directory already present on the user's PATH. Non-Windows hosts are not affected. This issue is fixed in version 0.12.18.

Affected products

astral-sh uv: from 0.12.7, < 0.12.18

References

https://github.com/astral-sh/uv/commit/67169645278ce082638d619beefa6d062540843b
https://github.com/astral-sh/uv/pull/21923
https://github.com/astral-sh/uv/releases/tag/0.12.18
https://github.com/astral-sh/uv/security/advisories/GHSA-2cv4-cqwr-gwf7

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