CVE-2026-78367 Rpm: rpmbuild gettarspec() crafted tar member name → macro injection
Attackers can execute arbitrary code by crafting a tarball with malicious member names processed by rpmbuild, affecting Red Hat and related Linux distributions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-78367?
CVE-2026-78367 is a high-severity code injection vulnerability in Red Hat Enterprise Linux 10, published on 24 Aug 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official 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).
Weakness: CWE-94
Which versions are affected by CVE-2026-78367?
How do I fix CVE-2026-78367?
Apply the vendor's patch.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-78367 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-78367 exists.
Sources
Also known as DEBIAN-CVE-2026-78367, ECHO-c708-0d0a-f19b, GHSA-pghw-ch4m-h3f9, OESA-2026-3860, OESA-2026-3861, OESA-2026-3862 and 3 more.