CVE-2026-70189

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Heap-based Buffer Overflow in SQL Server

Publication date: 2026-10-13

Last updated on: 2026-10-16

Assigner: Microsoft Corporation

Description

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

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-10-13

Last Modified

2026-10-16

Generated

2026-10-19

AI Q&A

2026-10-14

EPSS Evaluated

2026-10-18

NVD

CVE-2026-70189

Affected Vendors & Products

Vendor	Product	Version / Range
Microsoft	Microsoft	SQL Server 2017 (GDR) 14.0.0
Microsoft	Microsoft	SQL Server 2017 for x64-based Systems (CU31) 14.0.3006.16
Microsoft	Microsoft	SQL Server 2019 (GDR) 15.0.0
Microsoft	Microsoft	SQL Server 2019 for x64-based Systems (CU32) 15.0.4003.23
Microsoft	Microsoft	SQL Server 2022 (GDR) 16.0.0
Microsoft	Microsoft	SQL Server 2022 for x64-based Systems (CU27) 16.0.4003.1
Microsoft	Microsoft	SQL Server 2025 (CU8) *
Microsoft	Microsoft	SQL Server 2025 for x64-based Systems (CU9) 17.0.4006.2
Microsoft	Microsoft	SQL Server 2025 for x64-based Systems (GDR) 17.0.1050.2

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 with local access to execute arbitrary code on the affected system by exploiting a flaw in memory handling.

Impact Analysis

An attacker could gain control of the SQL Server process, potentially leading to data theft, unauthorized modifications, or disruption of database services. Local access is required, which limits the attack surface but still poses significant risk if exploited.

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, violating confidentiality requirements in GDPR and HIPAA. Organizations may face compliance penalties if exploited due to insufficient security controls.

Mitigation Strategies

Apply the latest cumulative update (CU) or security update for your SQL Server version immediately. Disable remote access if not required and restrict user permissions to minimize attack surface.

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