CVE-2026-84837

A flaw was found in rpm. An attacker can exploit a command injection vulnerability by influencing the path or filename of a tarball processed by rpmbuild -t* to include shell metacharacters. This is particularly relevant in automated build or continuous integration (CI) workflows that ingest externally supplied artifact names. Successful exploitation allows for arbitrary command execution with the privileges of the build user, which could lead to information disclosure or disruption of the build environment.

This issue is considered Moderate severity because, although successful exploitation can result in arbitrary command execution with the privileges of the user running rpmbuild, exploitation requires an attacker to influence the path or filename of a tarball that is subsequently processed by rpmbuild in tarball mode (-ta/-tb/-ts). The vulnerable code is not exposed as a network service and cannot be triggered remotely without a local build or CI workflow processing an attacker-controlled tarball name.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

To mitigate this issue, avoid using rpmbuild -t* with tarballs whose paths or filenames can be influenced by untrusted input. In automated build pipelines, ensure tarballs are staged into a trusted local directory and their names are normalized or validated to reject shell metacharacters before rpmbuild is invoked.