CVE-2026-18739: Red Hat Enterprise Linux 10

Low severity, CVSS 2.5. EPSS: 0.1% chance of exploitation in the next 30 days.

A flaw was found in popt, a command-line option parsing library. An off-by-one error in the poptStuffArgs function, when repeatedly called by a host application or through deep alias nesting, can lead to corruption of internal program data. This corruption could potentially enable a local attacker to execute arbitrary code if the host application then unsafely processes the altered data.

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 1.19-11.1.hum1 (fixed in 1.19-11.1.hum1)
• Red Hat Red Hat Openshift Container Platform 4
• Rpm-Software-Management Popt: from 1.1.1

Published 2026-08-04. Last modified 2026-08-31.