CVE-2025-71437

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

Published Oct 21, 2026 CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Astral
Astral uv
Vendors & Products Astral
Astral uv
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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.
Title Astral uv through 0.8.21 Path Traversal via Symlinks in Sdist Tar Extraction
Weaknesses CWE-22
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N'}

cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Oct 21, 2026, 3:51 PM
Reserved
Oct 20, 2026, 9:48 PM
Status
Awaiting Analysis
Published
Oct 21, 2026, 1:17 AM
Modified
Oct 28, 2026, 2:10 PM
Severity
Moderate
Public date
Oct 21, 2026, 12:36 AM