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CVE-2026-78456 Microsoft CVE debrief

CVE-2026-78456 is a high-severity heap-based buffer overflow vulnerability in SQL Server 2022. The vulnerability allows an authorized attacker to execute code over a network. SQL Server 2022 administrators and security teams responsible for patching and vulnerability management should review and apply the Microsoft patch immediately. The vulnerability has a high CVSS score of 8.8 and is considered a critical patch. The CVE record was published on 2026-09-08T18:20:44.280Z and has not been modified since then.

Vendor
Microsoft
Product
SQL Server 2022
CVSS
HIGH 8.8
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 2022 administrators and security teams responsible for patching and vulnerability management should review and apply the Microsoft patch immediately. The vulnerability has a high CVSS score of 8.8 and is considered a critical patch. The CVE record was published on 2026-09-08T18:20:44.280Z and has not been modified since then. The vulnerability affects SQL Server 2022 instances and requires immediate patch.

Why it matters

CVE-2026-78456 is a high-severity vulnerability in SQL Server 2022 that requires immediate attention from administrators and security teams

  • Potential code execution over the network by authorized attackers
  • Requires immediate patching and verification of SQL Server 2022 instances
  • Network access controls and monitoring may be necessary to mitigate exposure

Technical summary

CVE-2026-78456 is a heap-based buffer overflow vulnerability in SQL Server 2022 that allows an authorized attacker to execute code over a network. The vulnerability has a high CVSS score of 8.8 and is considered a critical patch. The vulnerability is caused by a buffer overflow in the SQL Server 2022 component. The CVE record was published on 2026-09-08T18:20:44.280Z and has not been modified since then.

Defensive priority

High priority for SQL Server 2022 administrators

Recommended defensive actions

  • Review and apply Microsoft patch for CVE-2026-78456
  • Inventory SQL Server 2022 instances for exposure
  • Verify network access controls for SQL Server

Evidence notes

Official CVE Program and NVD records confirm a heap-based buffer overflow in SQL Server 2022. The CVE record was published on 2026-09-08T18:20:44.280Z and has not been modified since then. The vulnerability has a high CVSS score of 8.8 and is considered a critical patch. The vendor advisory and patch are available for review and application.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-78456 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-78456

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

  • CVE-2026-78456 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-78456

    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.