SB2026070950 - Improper Handling of Unicode Encoding in setuptools

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Main Vulnerability Database SB2026070950

SB2026070950 - Improper Handling of Unicode Encoding in setuptools

Published: July 9, 2026

Security Bulletin ID SB2026070950
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper Handling of Unicode Encoding (CVE-ID: CVE-2026-59890)

CWE-ID: CWE-176 - Improper Handling of Unicode Encoding

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to improper handling of unicode encoding in setuptools FileList manifest exclusion matching when building a source distribution on normalization-preserving filesystems with Unicode filenames. A remote attacker can trick the victim into building and publishing a source distribution containing a specially named file to disclose sensitive information.

User interaction is required to build and publish the source distribution, and the issue is specific to Unicode normalization collisions such as NFC/NFD on macOS APFS or HFS+.


Remediation

Install update from vendor's website.

References