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CVE-2026-59890VulnerabilityPublished Updated

sdist · setuptools: MANIFEST.in exclusion bypass

Affects pyqt-builderSource GCVE Database

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

Not known to be exploited · CVSS 6.1 Medium : upgrade to 1.19.1_1 when convenient.

Data as of 26 Oct 2026, 17:16 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 1.19.1_1
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 pyqt-builder to 1.19.1_1.

Affected software

ProductAffectedFixed in
Homebrewpyqt-builderpkg:brew/pyqt-builderOther threatsAffected
  • >=1.16.0_1 <1.19.1_1
Fixed in
  • 1.19.1_1

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 1.19.1_1 that normalizes both file paths and MANIFEST.in patterns before matching to prevent exclusion bypass. Users should upgrade to this fixed version to mitigate the issue. No additional mitigation is required once patched.

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. This occurs on macOS APFS/HFS+ filesystems where filenames are stored in NFD form but MANIFEST.in patterns are typically written in NFC form, causing byte-level matching to fail. As a result, sensitive files with non-ASCII names may be unintentionally published to PyPI. This issue affects setuptools versions before 1.19.1_1 and has a fix available in 1.19.1_1.

References

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