CVE-2026-67381

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Heap-based Buffer Overflow in SQL Server

Publication date: 2026-09-08

Last updated on: 2026-09-09

Assigner: Microsoft Corporation

Description

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

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-08

Last Modified

2026-09-09

Generated

2026-09-29

AI Q&A

2026-09-10

EPSS Evaluated

2026-09-27

NVD

CVE-2026-67381

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	sql_server	*

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 elevate their privileges over a network by exploiting a flaw that overwrites memory in the heap.

Impact Analysis

An attacker could gain elevated privileges on your SQL Server, potentially allowing them to execute arbitrary code, access sensitive data, or take control of the system. This could lead to data breaches or system compromise.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating GDPR and HIPAA requirements for data protection and access control. Non-compliance may result in legal penalties and reputational damage.

Mitigation Strategies

Apply the latest security updates from Microsoft for SQL Server as soon as possible to patch the heap-based buffer overflow vulnerability.

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