Command Injection Vulnerability in rpm rpmbuild

CVE-2026-84837 is a command injection vulnerability found in the rpm package manager, specifically affecting the rpmbuild -t* functionality. The vulnerability arises when the utility processes tarballs with filenames or paths containing shell metacharacters. If an automated build process or continuous integration (CI) pipeline accepts externally sourced or untrusted filenames, an attacker can craft a filename that breaks the command structure, leading to arbitrary code execution.

The impact of this vulnerability is significant in CI/CD environments where build systems often run with elevated privileges or have access to sensitive development secrets. Exploitation occurs during the build process, allowing the attacker to run commands under the context of the user executing the rpmbuild command. Defenders should audit automated build scripts that use rpmbuild to ensure inputs are sanitized and to assess whether they are currently processing untrusted or unverified tarball artifacts.

Impact

Successful exploitation allows for arbitrary command execution with the privileges of the build user, leading to potential information disclosure of source code, theft of build credentials, or disruption of development and delivery pipelines. This flaw poses a high risk to automated environments processing third-party artifacts.

Recommendation

• Identify all automated CI/CD pipelines and developer workstations utilizing rpmbuild -t.
• Audit build scripts to determine if filenames or paths processed by rpmbuild are derived from user-controlled or external, untrusted sources.
• Apply security patches for rpm provided by distribution vendors as they become available to remediate CVE-2026-84837.
• Implement strict input validation and sanitization for all file artifacts passed to build utilities in CI/CD pipelines.