Medium severity · published Oct 21, 2026
CVE-2025-71437
Astral uv through 0.8.21 Path Traversal via Symlinks in Sdist Tar Extraction
6.5
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 27% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
UV
uv · astral-sh
through 0.8.21 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-71437
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-71437
github.com
https://github.com/astral-sh/uv/security/advisories/GHSA-7j9j-68r2-f35q
www.vulncheck.com
https://www.vulncheck.com/advisories/astral-uv-through-0.8.21-path-traversal-via-symlinks-in-sdist-tar-extraction
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