CVE-2026-67376 Microsoft CVE debrief

Who should care

SQL Server administrators, Database administrators, IT security teams, and operators of SQL Server instances exposed to the internet or used by untrusted users should assess exposure and apply patches immediately. Those responsible for monitoring and incident response plans should review and update them to address potential attacks.

Why it matters

An integer overflow or wraparound vulnerability exists in Microsoft SQL Server, which could allow an unauthorized attacker to deny service over a network. SQL Server administrators, Database administrators, and IT security teams should assess exposure and apply patches immediately. The vulnerability has a CVSS score of 7.5 and is considered HIGH severity.

• Denial of service (DoS) attacks may be possible, requiring defensive measures to prevent or mitigate.
• SQL Server instances may need to be patched or updated to prevent exploitation.
• Monitoring and incident response plans should be reviewed and updated to address potential attacks.

Technical summary

The vulnerability exists in Microsoft SQL Server and allows an unauthorized attacker to deny service over a network. The vulnerability has a CVSS score of 7.5 and is considered HIGH severity. Microsoft has released a patch for this vulnerability. The vulnerability could allow denial of service (DoS) attacks, requiring defensive measures to prevent or mitigate. SQL Server instances may need to be patched or updated to prevent exploitation.

Defensive priority

Apply patches immediately, especially for SQL Server instances exposed to the internet or used by untrusted users.

Recommended defensive actions

• Apply patches immediately, especially for SQL Server instances exposed to the internet or used by untrusted users.
• Review and update inventory of SQL Server instances to ensure all instances are patched.
• Monitor SQL Server instances for unusual activity.

Evidence notes

The vulnerability is described in the CVE Program record and the NVD vulnerability detail page. Microsoft has released a vendor advisory and patch for this vulnerability.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.