CVE intelligence

CVE-2026-42904

Vulnerability intelligence

Published Jun 9, 2026Sources checked Sep 28, 2026

9.6CRITICALCVSS out of 10

What this means

Review the available evidence

CVE-2026-42904 and is rated Critical severity with a CVSS score of 9.6. 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

EPSS0.5%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2026-42904?

Heap-based buffer overflow in Windows TCP/IP allows an unauthorized attacker to elevate privileges over an adjacent network.