CVE-2025-71437

MEDIUM 6.5

Astral uv through 0.8.21 Path Traversal via Symlinks in Sdist Tar Extraction

CVSS Score

6.5

EPSS Score

0.0%

EPSS Percentile

0th

Astral uv before 0.8.22 contains a path traversal vulnerability in source distribution (sdist) tar extraction that allows a specially crafted sequence of symlinks to redirect file writes outside the intended extraction prefix. Attackers can publish a malicious sdist that, when installed by a victim, writes arbitrary files to filesystem locations outside the installation prefix.

CWE	CWE-22
Vendor	astral-sh
Product	uv
Published	Oct 21, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Affected Versions

astral-sh / uv

0 ≤ 0.8.21

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/astral-sh/uv/security/advisories/GHSA-7j9j-68r2-f35q vulncheck.com: https://www.vulncheck.com/advisories/astral-uv-through-0.8.21-path-traversal-via-symlinks-in-sdist-tar-extraction

Credits

calebbrown charliermarsh woodruffw zanieb