CVE intelligence

CVE-2026-34339

Vulnerability intelligence

Published May 12, 2026Sources checked Nov 11, 2026

5.5MEDIUMCVSS out of 10

What this means

Review the available evidence

CVE-2026-34339 and is rated Medium severity with a CVSS score of 5.5. 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: May 12, 2026

Vendor remediation details

Install KB5087538. Install KB5087545. Install KB5087424. Install KB5087544. Install KB5094127. Install KB5087539. Install KB5087423. Install KB5089549. Install KB5089466. Install KB5087420. Install KB5093998. Install KB5087541. Install KB5089548. Install KB5087537.

Vendor-listed releases

10.0.17763.8755
10.0.20348.5139
10.0.20348.5074
10.0.19044.7291
10.0.19045.7417
10.0.26100.32860
10.0.26100.32772
10.0.26200.8457
10.0.26200.8390
10.0.22631.7079
10.0.22631.7219
10.0.25398.2330
10.0.26100.8457
10.0.26100.8390
10.0.28000.2113
10.0.14393.9140

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-2026-34339?

Null pointer dereference in Windows LDAP - Lightweight Directory Access Protocol allows an authorized attacker to deny service locally.

Source: NVD