CVE intelligence

CVE-2026-18839

Vulnerability intelligence

Published Aug 5, 2026Sources checked Sep 12, 2026

2.2LOWCVSS out of 10

What this means

Review the available evidence

CVE-2026-18839 and is rated Low severity with a CVSS score of 2.2. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.

CISA KEVNot listedBased on the latest collected catalog

EPSS0.1%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2026-18839?

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.