CVE-2026-78367

Name	CVE-2026-78367
Description	A vulnerability was found in RPM's rpmbuild tarball processing. When processing a crafted source archive, the getTarSpec() function in tools/rpmbuild.cc passes an attacker-controlled tar archive member name to rpmExpand() as part of a %{basename:...} macro expression. A specially crafted .spec member name can therefore inject RPM macros, including Lua expressions, resulting in arbitrary code execution with the privileges of the user running rpmbuild. This can be exploited when a victim or automated build system processes an attacker-controlled source tarball using rpmbuild tarball mode (such as -ts, -ta, or -tb).
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1145876

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
rpm (PTS)	bookworm	4.18.0+dfsg-1+deb12u1	vulnerable
	trixie	4.20.1+dfsg-3	vulnerable
	forky, sid	6.1.0-1	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
rpm	source	(unstable)	(unfixed)			1145876

[trixie] - rpm <no-dsa> (Minor issue)
[bookworm] - rpm <postponed> (Minor issue)
https://github.com/rpm-software-management/rpm/issues/4314