CVE-2026-78456

Analyzed Analyzed - Analysis Complete

Heap-based Buffer Overflow in SQL Server

Publication date: 2026-09-08

Last updated on: 2026-09-15

Assigner: Microsoft Corporation

Description

Heap-based buffer overflow in SQL Server allows an authorized attacker to execute code over a network.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-08

Last Modified

2026-09-15

Generated

2026-09-29

AI Q&A

2026-09-09

EPSS Evaluated

2026-09-27

NVD

CVE-2026-78456

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	sql_server_2022	to 16.0.1200.5 (exc)
microsoft	sql_server_2022	From 16.0.4003.1 (inc) to 16.0.4275.2 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-122	A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

Attack-Flow Graph

Executive Summary

This is a heap-based buffer overflow vulnerability in Microsoft SQL Server. It allows an authorized attacker to execute arbitrary code remotely over a network by exploiting a flaw in memory handling.

Impact Analysis

An attacker could gain control of the SQL Server process, leading to unauthorized data access, data manipulation, or complete system compromise. This could result in sensitive data breaches or service disruption.

Compliance Impact

This vulnerability could lead to unauthorized access or exposure of personal or health data, violating GDPR or HIPAA compliance. Organizations may face legal penalties, fines, or reputational damage if exploited.

Mitigation Strategies

Apply the latest security updates from Microsoft for SQL Server immediately to patch the heap-based buffer overflow vulnerability. Monitor Microsoft's security advisories for patches and verify installation on all affected systems.

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