CVE-2026-18743: 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. This vulnerability allows an attacker to provide specially crafted configuration content to a host, which, when loaded, can lead to a small memory corruption issue. This occurs because of an error in how the `poptConfigFileToString` function reallocates memory for buffers. Successful exploitation could result in heap metadata corruption, potentially causing the affected process to become unavailable (denial of service).

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 1.11

Published 2026-09-01. Last modified 2026-09-08.