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CVE-2026-62878: Windows DNS Server Remote Code Execution Vulnerability

criticalCVSS 9.8CVE-2026-62878
Stack-based buffer overflow in Windows DNS allows an unauthorized attacker to execute code over a network.

CSIRTS triage

vendor: Microsoftproduct: Windows DNS ServerMemory corruptionRemote code execution
What
Stack-based buffer overflow in Windows DNS allows an unauthorized attacker to execute code over a network.
Who is affected
Windows DNS servers exposed to untrusted DNS queries.
Urgency
Critical priority; network-exposed RCE with critical severity (CVSS 9.8) requires immediate action.
Action
Apply Microsoft security patch immediately; consider temporary DNS service restrictions or network isolation.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
critical — CVSS 9.8
Published
2026-08-11
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62878

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-2026-62878coverage & 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