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CVE-2026-59890VulnerabilityPublished Updated

sdist · setuptools: MANIFEST.in exclusion bypass

Affects flexgetSource GCVE Database

0
Authoritative record:CVE-2026-59890· Medium 6.1

Not known to be exploited · CVSS 6.1 Medium : upgrade to 3.19.27 when convenient.

Data as of 26 Oct 2026, 17:27 UTC

CVSS 3.1 base score
6.1Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.4% chance of exploitation in 30 days – higher than 34% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 3.19.27
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 8 Jul 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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 flexget to 3.19.27.

Affected software

ProductAffectedFixed in
Homebrewflexgetpkg:brew/flexgetOther threatsAffected
  • >=3.17.7 <3.19.27
Fixed in
  • 3.19.27

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 3.19.27 that normalizes both the on-disk filenames and MANIFEST.in patterns to a canonical Unicode form before matching. Users should upgrade to this fixed version to prevent exclusion bypass. Until upgrading, maintainers should be aware that MANIFEST.in exclusions for non-ASCII filenames may not work correctly on macOS filesystems and consider manually verifying source distributions for unintended files.

Description

A Unicode normalization mismatch in setuptools' handling of MANIFEST.in exclusions can cause files intended to be excluded from source distributions to be included instead. On macOS APFS and HFS+ filesystems, filenames stored in NFD form do not match exclusion patterns written in NFC form, leading to silent bypass of exclusion rules. This can result in unintended disclosure of private or secret files when publishing to PyPI. The issue affects non-ASCII filenames and is fixed in setuptools version 3.19.27.

References

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