sdist · setuptools: MANIFEST.in exclusion bypass
Affects shubSource GCVE Database
Not known to be exploited · CVSS 6.1 Medium : upgrade to 2.18.1 when convenient.
Data as of 26 Oct 2026, 19:00 UTC
- Patch
- Available – fixed in 2.18.1
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:NExploitation evidence
Disclosed: evidence found.
CVE published 8 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade shub to 2.18.1.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Homebrewshubpkg:brew/shubOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A fix is available in setuptools version 2.18.1 that normalizes both the walked file paths and MANIFEST.in patterns to a canonical Unicode form before matching. Users should upgrade to version 2.18.1 or later. Until then, maintainers should be aware that MANIFEST.in exclusions with non-ASCII filenames may not work correctly on macOS and consider normalizing filenames or patterns manually as a temporary workaround.
Description
A Unicode normalization mismatch in setuptools' handling of MANIFEST.in exclusion patterns can cause excluded files with non-ASCII names to be included in source distributions on macOS APFS/HFS+ filesystems. This occurs because the matching is done byte-for-byte without Unicode normalization, leading to exclusion bypass when the on-disk filename is in NFD form but the MANIFEST.in pattern is in NFC form. This can result in unintended disclosure of files intended to be excluded from published source distributions.
References
- github.com/pypa/setuptools/security/advisories/GHSA-h35f-9h28-mq5c (opens in a new tab)
- nvd.nist.gov/vuln/detail/CVE-2026-59890 (opens in a new tab)
- github.com/pypa/setuptools/commit/dd9f436a36486b4cb8a4c70a2321548b0be09b8f (opens in a new tab)
- github.com/pypa/advisory-database/tree/main/vulns/setuptools/PYSEC-2026-3447.yaml (opens in a new tab)
- github.com/pypa/setuptools (opens in a new tab)
- github.com/pypa/setuptools/releases/tag/v83.0.0 (opens in a new tab)