PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-67636 Microsoft CVE debrief

An out-of-bounds read vulnerability in Microsoft SQL Server could allow an authorized attacker to execute code over a network. The vulnerability has a CVSS score of 8.5 and is considered high severity. Microsoft has released a patch for this vulnerability. SQL Server administrators and users, especially those with instances exposed to the internet or used by multiple users, should assess exposure and apply patches immediately. The vulnerability is an out-of-bounds read in Microsoft SQL Server, which could allow an authorized attacker to execute code over a network. The affected versions include Microsoft SQL Server 2019 (CU 32), SQL Server 2022, and SQL Server 2025. Microsoft has a

Vendor
Microsoft
Product
Microsoft SQL Server 2019 (CU 32)
CVSS
HIGH 8.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-08
Original CVE updated
2026-09-15
Advisory published
2026-09-08
Advisory updated
2026-09-15

Who should care

SQL Server administrators and users, especially those with instances exposed to the internet or used by multiple users, should assess exposure and apply patches immediately.

Why it matters

An out-of-bounds read vulnerability in Microsoft SQL Server could allow authorized attackers to execute code over a network, posing a significant risk to data security and system integrity.

  • Authorized attackers could execute code over a network, potentially leading to data breaches or system compromise.
  • SQL Server instances exposed to the internet or used by multiple users are at higher risk of exploitation.
  • Applying patches immediately is crucial to prevent potential exploitation.

Technical summary

The vulnerability is an out-of-bounds read in Microsoft SQL Server, which could allow an authorized attacker to execute code over a network. The affected versions include Microsoft SQL Server 2019 (CU 32), SQL Server 2022, and SQL Server 2025. Microsoft has released patches for these versions.

Defensive priority

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

Recommended defensive actions

  • Apply patches immediately, especially for SQL Server instances exposed to the internet or used by multiple users.
  • Review and update inventory of SQL Server instances to ensure all affected versions are identified and patched.
  • Monitor SQL Server logs for potential exploitation attempts.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its CVSS score and affected versions of Microsoft SQL Server. The vulnerability has a CVSS score of 8.5 and is considered high severity. Microsoft has released patches for these versions. SQL Server instances exposed to the internet or used by multiple users are at higher risk of exploitation. Applying patches immediately is crucial to prevent potential exploitation. The CVE record was published on 2026-09-08T

Sources and references

Verified primary and authoritative sources

  • CVE-2026-67636 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-67636

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-67636 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-67636

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental 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.