sdist · setuptools: MANIFEST.in exclusion bypass
Affects aws-sam-cliSource GCVE Database
Not known to be exploited · CVSS 6.1 Medium : upgrade to 1.163.0_1 when convenient.
Data as of 26 Oct 2026, 19:43 UTC
- Patch
- Available – fixed in 1.163.0_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 aws-sam-cli to 1.163.0_1.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Homebrewaws-sam-clipkg:brew/aws-sam-cliOther 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 patch is available in setuptools version 1.163.0_1 that normalizes both the filesystem paths and MANIFEST.in patterns to a canonical Unicode form before matching, preventing exclusion bypass. Users should upgrade to this fixed version. Until then, maintainers should be aware that MANIFEST.in exclusions are normalization-insensitive on macOS and consider erring on the side of excluding more files. No other immediate action is required.
Description
A Unicode normalization mismatch in setuptools causes MANIFEST.in exclusion rules to fail on macOS APFS/HFS+ filesystems. When building source distributions, excluded files with non-ASCII names may be included if their on-disk Unicode form (NFD) differs from the pattern form (NFC). This leads to unintended disclosure of files intended to be excluded from published packages.
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)