CVE intelligence

CVE-2026-18739

Vulnerability intelligence

Published Aug 4, 2026Sources checked Sep 12, 2026

2.5LOWCVSS out of 10

What this means

Review the available evidence

CVE-2026-18739 and is rated Low severity with a CVSS score of 2.5. 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-2026-18739?

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.