---
id: CVE-2025-71437
title: Astral uv through 0.8.21 Path Traversal via Symlinks in Sdist Tar Extraction
summary: >-
  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 …
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N'
cvssSource: cna
cwe:
  - CWE-22
vendor: astral-sh
product: uv
affected:
  - uv <= 0.8.21
published: '2026-10-21'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T00:36:20.284Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2025-71437'
references:
  - url: 'https://github.com/astral-sh/uv/security/advisories/GHSA-7j9j-68r2-f35q'
    label: GitHub Security Advisory (GHSA-7j9j-68r2-f35q)
  - url: >-
      https://www.vulncheck.com/advisories/astral-uv-through-0.8.21-path-traversal-via-symlinks-in-sdist-tar-extraction
    label: >-
      VulnCheck Advisory: Astral uv through 0.8.21 Path Traversal via Symlinks
      in Sdist Tar Extraction
tags:
  - cve.org
ingestedAt: '2026-10-21T01:37:08.047Z'
---

## Overview

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.

## Affected

- `uv <= 0.8.21`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.