CVE-2026-70354

Analyzed Analyzed - Analysis Complete

Out-of-Bounds Write in .NET Framework

Publication date: 2026-08-11

Last updated on: 2026-08-17

Assigner: Microsoft Corporation

Description

Out-of-bounds write in .NET allows an unauthorized attacker to execute code locally.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-08-11

Last Modified

2026-08-17

Generated

2026-09-01

AI Q&A

2026-08-11

EPSS Evaluated

2026-08-30

NVD

CVE-2026-70354

EUVD

EUVD-2026-56770

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	visual_studio_2022	From 17.14.0 (inc) to 17.14.38 (exc)
microsoft	visual_studio_2026	From 18.8.0 (inc) to 18.8.3 (exc)
microsoft	.net_framework	4.8.1
microsoft	.net_framework	4.8
microsoft	.net_framework	4.6.2
microsoft	.net_framework	4.7
microsoft	.net_framework	4.7.1
microsoft	.net_framework	4.7.2
microsoft	.net_framework	3.5
microsoft	.net	From 10.0.0 (inc) to 10.0.11 (exc)
microsoft	.net	From 8.0.0 (inc) to 8.0.30 (exc)
microsoft	.net	From 9.0.0 (inc) to 9.0.19 (exc)

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 vulnerability is an out-of-bounds write issue in .NET. It allows an unauthorized attacker to execute code locally on a system. This occurs when software writes data outside the intended memory buffer, potentially corrupting data or enabling malicious code execution.

Detection Guidance

Detection typically involves checking for vulnerable .NET versions and monitoring for unusual code execution patterns. Use commands like 'dotnet --version' to verify installed .NET versions and compare against Microsoft's security updates. Check system logs for unexpected application crashes or memory access violations.

Impact Analysis

An attacker could exploit this to run arbitrary code on your system. This may lead to unauthorized access, data theft, or system compromise. Local execution means the attacker must already have some access to the system, but the impact could be severe if exploited.

Compliance Impact

This vulnerability allows unauthorized local code execution, which could lead to unauthorized access to sensitive data. This may violate compliance requirements for GDPR (data protection) and HIPAA (health information security) by enabling data breaches or unauthorized processing.

Mitigation Strategies

Apply the latest security updates from Microsoft for .NET as soon as possible to patch the out-of-bounds write vulnerability. Monitor Microsoft's security advisories for patches and follow their guidance for mitigation.

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