Vulnerability · Published Oct 2, 2026 · Assigned by GitHub_M

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

Medium 5.9

In plain English

A medium-severity path traversal in uv from astral-sh. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)5.9Medium

Exploit odds (30 days)0.4%top 63.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	uv	0.12.18	GHSA-2cv4-cqwr-gwf7
PyPI	uv	0.12.18	PYSEC-2026-4305
Ubuntu:26.10	uv	no fix listed	UBUNTU-CVE-2026-104843
Ubuntu:26.10	uv-full	no fix listed	UBUNTU-CVE-2026-104843

Affected products (as reported)

Vendor	Product	Versions
astral-sh	uv	>= 0.12.7, < 0.12.18

Weakness: CWE-22 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

References

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