CVE-2025-71437CWE-22path-traversal

CVE-2025-71437

Medium · published October 21, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
20.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
CVSS v4.0
8.7 · 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
EPSS
0.00285 · 20.0th percentile
Weakness
CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Published
2026-10-21T05:17Z
References (2)
https://github.com/astral-sh/uv/security/advisories/GHSA-7j9j-68r2-f35q · [email protected]https://www.vulncheck.com/advisories/astral-uv-through-0.8.21-path-traversal-via-symlinks-in-sdist-tar-extraction · [email protected]
EPSS history
Timeline
  • 22 OCT 03:28Z
    EPSS moved — → 0%
    epss
  • 21 OCT 00:36Z
    Astral uv through 0.8.21 Path Traversal via Symlinks in Sdist Tar Extraction
    cvelistv5
  • 21 OCT 00:36Z
    Astral uv through 0.8.21 Path Traversal via Symlinks in Sdist Tar Extraction
    cvelistv5