CVE-2026-88085

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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 elevate privileges 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-2026-88085

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 in Microsoft SQL Server. An authorized attacker can exploit it to elevate their privileges locally by overwriting memory in the heap, potentially gaining higher access levels than intended.

Impact Analysis

An attacker could gain elevated privileges on your system, allowing them to read sensitive data, modify system configurations, or install malicious software. This could lead to data breaches or system compromise if exploited.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating GDPR's data protection requirements or HIPAA's security rules. Organizations may face fines or legal consequences if exploited due to inadequate security measures.

Mitigation Strategies

Apply the latest cumulative update (CU) or security update for your SQL Server version immediately. Microsoft has released patches for affected versions including 2017, 2019, 2022, and 2025.

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