5.9

CVE-2026-104843: astral-sh uv Path Traversal

CVSS: 5.9v4.0MediumAwaiting analysis
AliasesGHSA-2cv4-cqwr-gwf7PYSEC-2026-4305UBUNTU-CVE-2026-104843
Published 02-10-2026Last modified 02-10-2026
Open JSON

Vulnerability summary

CVE-2026-104843 is a medium (CVSS 5.9) Path Traversal vulnerability in astral-sh uv. EPSS estimates a 0.43% chance of exploitation in the next 30 days, higher than 35.4% of scored vulnerabilities.

Overall risk
24/100
0100
Low · default modelHow is this calculated?
CVSS score
5.9/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.43%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 02-10-2026
    PublishedVulnerability first disclosed.
  2. 02-10-2026
    Last modifiedVulnerability information updated.

Description

uv is a Python package and project manager written in Rust. From 0.12.7 until 0.12.18, uv wheel extraction on Windows can process a malicious wheel in a way that writes a file outside the installation prefix, including an executable in a directory already present on the user's PATH. Non-Windows hosts are not affected. This issue is fixed in version 0.12.18.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.43%

Chance of exploitation in the next 30 days

Percentile

35%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

03-10-202620-10-2026
EPSS score
0.43%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu2 products
  • uvAll versions (No fix recorded)
  • uv-fullAll versions (No fix recorded)
Astral-sh1 product
  • uv≥ 0.12.7, < 0.12.18
Crates.Io1 product
  • uv≥ 0.12.7, < 0.12.18
PyPI1 product
  • uv≥ 0.12.7, < 0.12.18

4 vendors · 5 products

References

10 links