pyp2spec is Vulnerable to Code Injection
Impact
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.
The macro evaluates during spec parsing, not only during the build step. Any rpm tool touching the generated spec triggers execution, rpmbuild -bs, rpmbuild --nobuild, rpm -q --specfile, so the victim doesn't need to commit to a full build before getting compromised. The realistic attack path is typosquatting or targeting a package known to be under Fedora review rather than drive-by publishing. Fedora packagers hold dist-git SSH keys, Koji build credentials, and Bodhi update credentials, so compromise of one packager's workstation enables committing malicious source to dist-git and riding it through the normal build pipeline to end users.
Patches
Patched in 0.14.1.
Workarounds
None
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | pyp2spec | < 0.14.1 | 0.14.1 |
References
- https://github.com/befeleme/pyp2spec/security/advisories/GHSA-r35x-v8p8-xvhw
- https://nvd.nist.gov/vuln/detail/CVE-2026-42301
- https://github.com/befeleme/pyp2spec
- https://github.com/befeleme/pyp2spec/releases/tag/v0.14.1
- https://pypi.org/project/pyp2spec
- https://github.com/advisories/GHSA-r35x-v8p8-xvhw
- CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H- Weakness (CWE)
CWE-20, CWE-94- Platform
- Python (PyPI)
- Package
pyp2spec- Disclosed
- 04.05.2026
- Updated
- 11.10.2026 14:18
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2026-3003 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-r35x-v8p8-xvhw - CC BY 4.0
Vulnerability history: pyp2spec
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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