CVE-2026-18839: Red Hat Enterprise Linux 10

Low severity, CVSS 2.2. EPSS: 0.1% chance of exploitation in the next 30 days.

An integer underflow was found in the popt library when formatting help text for option tables that exceed the terminal width. A local user who can cause an application to print help under those conditions may cause that application to crash or fail to display help, resulting in a denial of service of the affected application.

Affected products

• Red Hat Red Hat Enterprise Linux 10
• Red Hat Red Hat Enterprise Linux 6
• Red Hat Red Hat Enterprise Linux 7
• Red Hat Red Hat Enterprise Linux 8
• Red Hat Red Hat Enterprise Linux 9
• Red Hat Red Hat Hardened Images: before 1.19-11.2.hum1 (fixed in 1.19-11.2.hum1)
• Red Hat Red Hat Openshift Container Platform 4
• Rpm-Software-Management Popt: from 1.13

Published 2026-08-05. Last modified 2026-10-08.