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CVE-2026-65789: Windows DNS Server Remote Code Execution Vulnerability

highCVSS 8.1CVE-2026-65789
Use after free in Windows DNS allows an unauthorized attacker to execute code over a network.

CSIRTS triage

vendor: Microsoftproduct: Windows DNS ServerRemote code executionMemory corruption
What
Use after free in Windows DNS allows an unauthorized attacker to execute code over a network.
Who is affected
Any system running Windows DNS Server exposed to network access.
Urgency
High severity with CVSS 8.1 and network-exploitable by unauthorized attackers; requires immediate patching.
Action
Apply the latest Windows DNS Server security patch immediately.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 8.1
Published
2026-08-11
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65789

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-65789coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Windows DNS Server

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

More from Microsoft Security Response Center