CVE-2026-77484

Analyzed Analyzed - Analysis Complete

Deserialization of Untrusted Data in SQL Server

Publication date: 2026-09-08

Last updated on: 2026-09-15

Assigner: Microsoft Corporation

Description

Deserialization of untrusted data in SQL Server allows an authorized attacker to execute code over a network.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-08

Last Modified

2026-09-15

Generated

2026-09-29

AI Q&A

2026-09-09

EPSS Evaluated

2026-09-27

NVD

CVE-2026-77484

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	sql_server_2022	to 16.0.1200.5 (exc)
microsoft	sql_server_2022	From 16.0.4003.1 (inc) to 16.0.4275.2 (exc)
microsoft	sql_server_2019	to 15.0.2190.7 (exc)
microsoft	sql_server_2019	From 15.0.4003.23 (inc) to 15.0.4490.9 (exc)
microsoft	sql_server_2025	to 17.0.1135.8 (exc)
microsoft	sql_server_2025	From 17.0.4006.2 (inc) to 17.0.4085.5 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-502	The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

Attack-Flow Graph

Executive Summary

This vulnerability involves deserialization of untrusted data in SQL Server. An authorized attacker can exploit this to execute arbitrary code remotely over a network.

Impact Analysis

An attacker could gain control over your SQL Server, leading to unauthorized data access, data manipulation, or system compromise. This may result in data breaches or service disruption.

Compliance Impact

This vulnerability could lead to unauthorized access or exposure of sensitive data, violating GDPR or HIPAA requirements for data protection and confidentiality.

Mitigation Strategies

Apply the latest security updates from Microsoft for SQL Server immediately. Disable unnecessary network access to SQL Server instances and restrict authorized user permissions to reduce attack surface.

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