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Vulnerability record · CVE-2026-42301 · published 9 May 2026

CVE-2026-42301: Improper input validation vulnerability

pyp2spec generates working Fedora RPM spec file for Python projects. Prior to version 0.14.1, pyp2spec was writing PyPI package metadata (e.g. the summary field) into the generated spec file without escaping RPM macro directives. When a packager then runs rpmbuild, those directives get evaluated, so a malicious package can execute arbitrary commands on the build machine. This issue has been patched in version 0.14.1.

7.8 CVSS 3.1 High EPSS 0.23% · top 87.9% CWE-20 · Improper input validationCWE-94 · Code injection Deferred
7.8CVSS 3.1 base score
0.23%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
24 Jul 2026Last modified by NVD

Description

pyp2spec generates working Fedora RPM spec file for Python projects. Prior to version 0.14.1, pyp2spec was writing PyPI package metadata (e.g. the summary field) into the generated spec file without escaping RPM macro directives. When a packager then runs rpmbuild, those directives get evaluated, so a malicious package can execute arbitrary commands on the build machine. This issue has been patched in version 0.14.1.

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

References

LinkTags
https://github.com/befeleme/pyp2spec/releases/tag/v0.14.1
https://github.com/befeleme/pyp2spec/security/advisories/GHSA-r35x-v8p8-xvhw

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Source: NIST National Vulnerability Database (record CVE-2026-42301), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.