CVE intelligence

CVE-2026-100219

Vulnerability intelligence

Published Oct 13, 2026Sources checked Oct 21, 2026

9.8CRITICALCVSS out of 10

What this means

Review the available evidence

CVE-2026-100219 and is rated Critical severity with a CVSS score of 9.8. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.

What to do next

Remediation and response

Microsoft Security Response Center guidance

Vendor revision: Oct 13, 2026

Vendor remediation details

Install KB5126655. Install KB5126653. Install KB5127648. Install KB5126646. Install KB5127646.

Vendor-listed releases

10.0.20348.5761
10.0.22631.7652
10.0.26100.9711
10.0.26200.9711
10.0.26300.9711
10.0.26100.33650
10.0.28000.3231

CISA KEVNot listedBased on the latest collected catalog

EPSS1.0%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2026-100219?

Use after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.

Source: NVD