CVE-2026-85919
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Heap-based Buffer Overflow in Microsoft 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.

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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-2026-85919

Affected Vendors & Products

Showing 7 associated CPEs
Vendor Product Version / Range
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
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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 with local access to elevate their privileges by exploiting a flaw in memory handling.

Impact Analysis

An attacker could gain higher privileges on the system running SQL Server, potentially allowing them to execute arbitrary code, access sensitive data, or disrupt services.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating compliance requirements for GDPR and HIPAA, which mandate strict data protection and access controls.

Mitigation Strategies

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

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