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CVE-2026-62790: Windows SMBv3 Server Remote Code Execution Vulnerability

highCVSS 8.8CVE-2026-62790
Heap-based buffer overflow in Windows SMB Server allows an authorized attacker to execute code over a network.

CSIRTS triage

vendor: Microsoftproduct: Windows SMBv3 ServerRemote code executionMemory corruption
What
A heap-based buffer overflow in Windows SMB Server allows an authorized attacker to execute code over a network.
Who is affected
Systems running Windows SMBv3 Server with network access from authorized users.
Urgency
Critical severity (CVSS 8.8); network-reachable code execution not yet exploited.
Action
Apply Windows Update patches addressing CVE-2026-62790 immediately.

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
high — CVSS 8.8
Published
2026-08-11
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62790

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-2026-62790coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

Recent advisories for Windows SMBv3 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