CVE intelligence

CVE-2026-71339

Vulnerability intelligence

Published Sep 8, 2026Sources checked Oct 28, 2026

6.7MEDIUMCVSS out of 10

What this means

Review the available evidence

CVE-2026-71339 and is rated Medium severity with a CVSS score of 6.7. 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 16, 2026

Install KB5122876. Install KB5122882. Install KB5122878. Install KB5122871. Install KB5124008. Install KB5122880. Install KB5124012. Install KB5123099. Install KB5123065. Install KB5123066.

CISA KEVNot listedBased on the latest collected catalog

EPSS0.3%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2026-71339?

Heap-based buffer overflow in Windows Installer allows an authorized attacker to elevate privileges locally.

Source: NVD