CVE-2026-85886
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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 over a network.

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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-2026-85886

Affected Vendors & Products

Showing 8 associated CPEs
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 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
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KEV
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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().

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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, modification, or deletion. This could result in data breaches, system compromise, or further network infiltration.

Compliance Impact

This vulnerability could lead to unauthorized access or exposure of sensitive data, violating GDPR and HIPAA requirements for data protection and confidentiality. Organizations may face legal penalties and reputational damage.

Mitigation Strategies

Apply the latest cumulative update or security update for your SQL Server version as soon as possible to patch the heap-based buffer overflow vulnerability.

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