CVE-2026-87697

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Deserialization of Untrusted Data in .NET Framework

Publication date: 2026-10-13

Last updated on: 2026-10-22

Assigner: Microsoft Corporation

Description

Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code over a network.

CVSS Scores

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Meta Information

Published

2026-10-13

Last Modified

2026-10-22

Generated

2026-11-08

AI Q&A

2026-10-14

EPSS Evaluated

2026-11-07

NVD

CVE-2026-87697

EUVD

EUVD-2026-99638

Affected Vendors & Products

Vendor	Product	Version / Range
Microsoft	.NET 10.0	10.0.0
Microsoft	.NET 11.0	11.0.0
Microsoft	.NET 8.0	8.0.0
Microsoft	.NET 9.0	9.0.0
Microsoft	Microsoft Visual Studio 2022 version 17.14	17.14.0
Microsoft	Microsoft Visual Studio 2026 version 18.10	18.10.0

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 .NET, allowing an unauthorized attacker to execute arbitrary code remotely over a network.

Impact Analysis

An attacker could exploit this to run malicious code on affected systems, potentially leading to data breaches, system compromise, or unauthorized access to sensitive information.

Compliance Impact

This vulnerability could lead to unauthorized data access or exfiltration, violating GDPR's data protection requirements and HIPAA's security rules for protected health information.

Mitigation Strategies

Apply the latest security updates from Microsoft for .NET and Visual Studio. Disable deserialization of untrusted data if possible. Monitor network traffic for suspicious activity related to deserialization.

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