CVE-2026-70197

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Out-of-Bounds Write in .NET Framework

Publication date: 2026-10-13

Last updated on: 2026-10-14

Assigner: Microsoft Corporation

Description

Out-of-bounds write in .NET allows an unauthorized attacker to execute code over a network.

CVSS Scores

EPSS Scores

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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-2026-70197

EUVD

EUVD-2026-99701

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-787	The product writes data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

Executive Summary

This is an out-of-bounds write vulnerability in .NET that allows an unauthorized attacker to execute arbitrary code remotely over a network without needing user interaction.

Impact Analysis

An attacker could exploit this to run malicious code on your system, potentially stealing data, installing malware, or taking control of your device if you are using vulnerable versions of .NET or Visual Studio.

Compliance Impact

This vulnerability allows remote code execution, which could lead to unauthorized access or data breaches. Such breaches may violate GDPR's data protection requirements or HIPAA's safeguards for protected health information.

Mitigation Strategies

Apply the latest security updates from Microsoft for .NET 8.0, 9.0, 10.0, and 11.0, as well as Visual Studio 2022 17.14 and Visual Studio 2026 18.10. Check the Microsoft Update Guide for specific patches.

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