CVE-2026-42301CWE-20CWE-94

Improper Input Validation leading to Improper Control of Generation of Code ('Code Injection') in pyp2spec

High · published May 9, 2026

CVSS v3.1
7.8
EPSS
0%
Percentile
12.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.8 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00227 · 12.7th percentile
Weaknesses
CWE-20 · Improper Input Validation; CWE-94 · Improper Control of Generation of Code ('Code Injection')
Published
2026-05-09T03:59Z
EPSS history
Timeline
  • 09 MAY 03:59Z
    Improper Input Validation leading to Improper Control of Generation of Code ('Code Injection') in pyp2spec
    cvelistv5