CVE-2026-84233

Summary

A flaw was found in rpm. A local attacker could supply a specially crafted .gem filename containing RPM macro syntax. When a user or automated workflow invokes rpmuncompress -x on this file, the macro expansion occurs during command construction. This allows the attacker to execute arbitrary commands with the privileges of the invoking account, leading to a compromise of confidentiality, integrity, and availability.

Affected Software

Weaknesses

• CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Workarounds

To mitigate this vulnerability, avoid using rpmuncompress -x (or a build workflow that invokes it via %{__rpmuncompress}) on .gem files from untrusted sources. Before extraction, rename .gem files to remove any RPM macro syntax (e.g., %(...)) or utilize an alternative extraction tool that does not expand RPM macros in filenames. In automated environments, implement validation to reject or sanitize untrusted archive names prior to processing

References

• https://access.redhat.com/security/cve/CVE-2026-84233
• https://bugzilla.redhat.com/show_bug.cgi?id=2478409

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