CVE-2026-59890

setuptools: MANIFEST.in exclusion bypass in sdist via Unicode normalization collision (NFC/NFD) on macOS APFS/HFS+

setuptools is a package that allows users to download, build, install, upgrade, and uninstall Python packages. Prior to 83.0.0, FileList applied MANIFEST.in exclude, global-exclude, recursive-exclude, and prune directives by matching compiled glob patterns against on-disk file names without Unicode normalization, so on macOS APFS or HFS+ an NFD file name could bypass an NFC exclusion rule and be packed into a source distribution. This issue is fixed in version 83.0.0.

Affected

pypa · setuptools

CVSS v3.1 GITHUB

6.1 MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

EPSS

0.40% chance of exploitation in the next 30 days, 33rd percentile

Published

2026-07-08

Proof-of-concept exploits (1)

• advisories/GHSA-h35f-9h28-mq5c

Security advisories

• pypa/setuptools/security/advisories/GHSA-h35f-9h28-mq5c
• pypa/setuptools/commit/dd9f436a36486b4cb8a4c70a2321548b0be09b8f

References

• CVE Record
• NVD entry