CVE-2026-70035

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Deserialization of Untrusted Data in .NET Framework

Publication date: 2026-10-13

Last updated on: 2026-10-14

Assigner: Microsoft Corporation

Description

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

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-10-13

Last Modified

2026-10-14

Generated

2026-10-19

AI Q&A

2026-10-14

EPSS Evaluated

2026-10-18

NVD

CVE-2026-70035

EUVD

EUVD-2026-100197

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	.NET Framework 3.5 3.5.0
Microsoft	Microsoft	.NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 3.0.0.0
Microsoft	Microsoft	.NET Framework 3.5 AND 4.7.2 4.7.0
Microsoft	Microsoft	.NET Framework 3.5 AND 4.8 4.8.0
Microsoft	Microsoft	.NET Framework 3.5 AND 4.8.1 4.8.1
Microsoft	Microsoft	.NET Framework 4.6.2/4.7/4.7.1/4.7.2 4.7.0
Microsoft	Microsoft	.NET Framework 4.8 4.8.0
Microsoft	Microsoft	.NET Framework 4.8.1 4.8.0.0
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 Framework. An attacker can exploit this to execute arbitrary code remotely over a network without authentication.

Impact Analysis

An attacker could gain control of affected systems, steal data, install malware, or disrupt services. Systems using vulnerable .NET versions are at risk if they process untrusted input.

Compliance Impact

This vulnerability allows remote code execution via deserialization of untrusted data, which could lead to unauthorized access, data breaches, or system compromise. Such incidents may violate GDPR's data protection requirements or HIPAA's security rules, depending on the affected system and data processed.

Mitigation Strategies

Apply the latest security updates from Microsoft for .NET Framework and Visual Studio as soon as possible to patch the deserialization vulnerability.

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