CVE-2026-67386 Microsoft CVE debrief

Who should care

Defenders responsible for SQL Server instances, especially those exposed to the internet or used by multiple users, should prioritize patching affected systems.

Why it matters

CVE-2026-67386 is a medium-severity vulnerability in SQL Server that allows an authorized attacker to disclose information over a network. Defenders should prioritize patching affected systems, especially those exposed to the internet or used by multiple users, to prevent potential information disclosure.

• Information disclosure may occur due to exploitation of this vulnerability.
• Patching affected systems is crucial to prevent potential information disclosure.
• Defenders should verify and apply vendor-provided patches to mitigate the vulnerability.
• Monitoring for suspicious activity on affected systems is recommended.

Technical summary

The vulnerability is caused by the use of an uninitialized resource in SQL Server, which allows an authorized attacker to disclose information over a network. The affected versions include SQL Server 2017, 2019, 2022, and 2025. This vulnerability allows an authorized attacker to disclose information, potentially leading to information disclosure. The vulnerability has a CVSS score of 6.5 and is considered medium severity.

Defensive priority

Defenders should prioritize patching affected SQL Server instances, especially those exposed to the internet or used by multiple users.

Recommended defensive actions

• Patch affected SQL Server instances
• Verify and apply vendor-provided patches
• Monitor for suspicious activity on affected systems

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its description, CVSS score, and affected versions. The vulnerability is caused by the use of an uninitialized resource in SQL Server, which allows an authorized attacker to disclose information over a network. Microsoft SQL Server versions 2017, 2019, 2022, and 2025 are affected. There is no indication of publicly available exploits or reports of this vulnerability being exploited in the wild. However, it is

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.