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CVE-2026-57089: Windows SMB Server Network Transport Driver (srvnet.sys) Remote Code Execution Vulnerability

highCVSS 7.5CVE-2026-57089
Use after free in Windows SMB Server Network Transport Driver (srvnet.sys) allows an unauthorized attacker to execute code over a network.

CSIRTS triage

vendor: Microsoftproduct: WindowsRemote code execution
What
A use after free vulnerability in Windows SMB Server Network Transport Driver allows an unauthorized attacker to execute code over a network.
Who is affected
Users of Windows SMB Server are affected.
Urgency
Remediation is urgent due to the high severity of the remote code execution vulnerability.
Action
Patch to the latest version of Windows.

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 7.5
Published
2026-07-14
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-57089

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-2026-57089coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

Recent advisories for Windows SMB 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