What’s Vulnerable › Vulnerabilities

CVE-2026-84233: Rpm: command execution via macro expansion in `rpmuncompress -x` for crafted `.gem` filenames

• Severity: high (CVSS 7.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-01 · updated 2026-10-02
• Weakness: CWE-78

Description

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 products

• Red Hat Enterprise Linux 10: all versions
• Red Hat Hardened Images: all versions — fixed in 6.1.0-1.hum1

How to fix

Upgrade to a fixed version: Red Hat Hardened Images 6.1.0-1.hum1. Check the vendor advisory for mitigations.

References

• https://access.redhat.com/errata/RHSA-2026:66637
• https://access.redhat.com/security/cve/CVE-2026-84233
• https://bugzilla.redhat.com/show_bug.cgi?id=2478409

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