CVE-2026-70354 - Vulnerability Details

- .NET Core Remote Code Execution Vulnerability

Description

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

Published: 2026-08-11

Score: 7.8 High

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Microsoft

.NET 10.0

affected

Version	Status	Constraints
`10.0.0`	affected	< 10.0.11

Microsoft

.NET 8.0

affected

Version	Status	Constraints
`8.0.0`	affected	< 8.0.30

Microsoft

.NET 9.0

affected

Version	Status	Constraints
`9.0.0`	affected	< 9.0.19

Microsoft

Microsoft .NET Framework 3.5

affected

Version	Status	Constraints
`3.5.0`	affected	< 2.0.50727.8984 & 3.0.30729.8980

Microsoft

Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2

affected

Version	Status	Constraints
`3.0.0.0`	affected	< 2.0.50727.8984 & 3.0.30729.8980 & 4.7.4144.0

Microsoft

Microsoft .NET Framework 3.5 AND 4.7.2

affected

Version	Status	Constraints
`4.7.0`	affected	< 2.0.50727.9070 & 3.0.30729.9068 & 4.7.4144.0

Microsoft

Microsoft .NET Framework 3.5 AND 4.8

affected

Version	Status	Constraints
`4.8.0`	affected	< 2.0.50727.9070 & 3.0.30729.9068 & 4.8.4805.0

Microsoft

Microsoft .NET Framework 3.5 AND 4.8.1

affected

Version	Status	Constraints
`4.8.1`	affected	< 2.0.50727.9183 & 3.0.30729.9169 & 4.8.9343.0

Microsoft

Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2

affected

Version	Status	Constraints
`4.7.0`	affected	< 4.7.4144.0

Microsoft

Microsoft .NET Framework 4.8

affected

Version	Status	Constraints
`4.8.0`	affected	< 4.8.4805.0

Microsoft

Microsoft .NET Framework 4.8.1

affected

Version	Status	Constraints
`4.8.0.0`	affected	< 4.8.9344.0

Microsoft

Microsoft Visual Studio 2022 version 17.14

affected

Version	Status	Constraints
`17.14.0`	affected	< 17.14.38

Microsoft

Microsoft Visual Studio 2026 version 18.8

affected

Version	Status	Constraints
`18.0`	affected	< 18.8.3

No data.

Vendor Product Confidence Versions

Microsoft

.net

85%

Version	Status	Scheme	Platform
`[10.0.0,10.0.11)`	affected	semver	—

Microsoft

.net

88%

Version	Status	Scheme	Platform
`[8.0.0,8.0.30)`	affected	semver	—

Microsoft

.net

88%

Version	Status	Scheme	Platform
`[9.0.0,9.0.19)`	affected	semver	—

Microsoft

.net Framework

100%

Version	Status	Scheme	Platform
`[3.5.0,2.0.50727.8984 & 3.0.30729.8980)`	affected	generic	['windows_11_version_26h1_for_arm64-based_systems', 'windows_11_version_26h1_for_x64-based_systems', 'windows_server_2012', 'windows_server_2012_(server_core_installation)', 'windows_server_2012_r2', 'windows_server_2012_r2_(server_core_installation)']

Microsoft

.net Framework

100%

Version	Status	Scheme	Platform
`[3.0.0.0,2.0.50727.8984 & 3.0.30729.8980 & 4.7.4144.0)`	affected	generic	['windows_10_version_1607_for_32-bit_systems', 'windows_10_version_1607_for_x64-based_systems', 'windows_server_2016', 'windows_server_2016_(server_core_installation)']

Microsoft

.net Framework

100%

Version	Status	Scheme	Platform
`[4.7.0,2.0.50727.9070 & 3.0.30729.9068 & 4.7.4144.0)`	affected	generic	['windows_10_version_1809_for_32-bit_systems', 'windows_10_version_1809_for_arm64-based_systems', 'windows_10_version_1809_for_x64-based_systems', 'windows_server_2019', 'windows_server_2019_(server_core_installation)']

Microsoft

.net Framework

100%

Version	Status	Scheme	Platform
`[4.8.0,2.0.50727.9070 & 3.0.30729.9068 & 4.8.4805.0)`	affected	generic	['windows_10_version_1809_for_32-bit_systems', 'windows_10_version_1809_for_arm64-based_systems', 'windows_10_version_1809_for_x64-based_systems', 'windows_10_version_21h2_for_32-bit_systems', 'windows_10_version_21h2_for_arm64-based_systems', 'windows_10_version_21h2_for_x64-based_systems', 'windows_10_version_22h2_for_32-bit_systems', 'windows_10_version_22h2_for_arm64-based_systems', 'windows_10_version_22h2_for_x64-based_systems', 'windows_server_2019', 'windows_server_2019_(server_core_installation)', 'windows_server_2022', 'windows_server_2022_(server_core_installation)']

Microsoft

.net Framework

100%

Version	Status	Scheme	Platform
`[4.8.1,2.0.50727.9183 & 3.0.30729.9169 & 4.8.9343.0)`	affected	generic	['windows_10_version_21h2_for_32-bit_systems', 'windows_10_version_21h2_for_arm64-based_systems', 'windows_10_version_21h2_for_x64-based_systems', 'windows_10_version_22h2_for_32-bit_systems', 'windows_10_version_22h2_for_arm64-based_systems', 'windows_10_version_22h2_for_x64-based_systems', 'windows_11_version_23h2_for_arm64-based_systems', 'windows_11_version_23h2_for_x64-based_systems', 'windows_11_version_24h2_for_arm64-based_systems', 'windows_11_version_24h2_for_x64-based_systems', 'windows_11_version_25h2_for_arm64-based_systems', 'windows_11_version_25h2_for_x64-based_systems', 'windows_server_2022', 'windows_server_2022_(server_core_installation)', 'windows_server_2025', 'windows_server_2025_(server_core_installation)']

Microsoft

.net Framework

100%

Version	Status	Scheme	Platform
`[4.7.0,4.7.4144.0)`	affected	generic	['windows_server_2012', 'windows_server_2012_(server_core_installation)', 'windows_server_2012_r2', 'windows_server_2012_r2_(server_core_installation)']

Microsoft

.net Framework

100%

Version	Status	Scheme	Platform
`[4.8.0,4.8.4805.0)`	affected	generic	['windows_10_version_1607_for_32-bit_systems', 'windows_10_version_1607_for_x64-based_systems', 'windows_server_2012', 'windows_server_2012_(server_core_installation)', 'windows_server_2012_r2', 'windows_server_2012_r2_(server_core_installation)', 'windows_server_2016', 'windows_server_2016_(server_core_installation)']

Microsoft

.net Framework

100%

Version	Status	Scheme	Platform
`[4.8.0.0,4.8.9344.0)`	affected	generic	['windows_11_version_26h1_for_arm64-based_systems', 'windows_11_version_26h1_for_x64-based_systems']

Microsoft

Microsoft Visual Studio 2022

84%

Version	Status	Scheme	Platform
`[17.14.0,17.14.38)`	affected	semver	—

Microsoft

Microsoft Visual Studio 2026

85%

Version	Status	Scheme	Platform
`[18.0,18.8.3)`	affected	semver	—

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Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

Sign in to view the affected projects.

Advisories

Source	ID	Title
Github GHSA	GHSA-gg8c-3338-xw2f	Microsoft Security Advisory CVE-2026-70354 – .NET Core Remote Code Execution Vulnerability

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00387.

Exploitation none

Automatable no

Technical Impact total

References

Link	Providers
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70354

History

Fri, 14 Aug 2026 13:00:00 +0000

Type	Values Removed	Values Added
First Time appeared		Microsoft microsoft Visual Studio 2022 Microsoft microsoft Visual Studio 2026
Vendors & Products		Microsoft microsoft Visual Studio 2022 Microsoft microsoft Visual Studio 2026

Wed, 12 Aug 2026 18:30:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Tue, 11 Aug 2026 17:15:00 +0000

Type	Values Removed	Values Added
Description		Out-of-bounds write in .NET allows an unauthorized attacker to execute code locally.
Title		.NET Core Remote Code Execution Vulnerability
First Time appeared		Microsoft Microsoft .net Microsoft .net Framework Microsoft visual Studio 2022 Microsoft visual Studio 2026
Weaknesses		CWE-787
CPEs		cpe:2.3:a:microsoft:.net:::::::: cpe:2.3:a:microsoft:.net_framework:::::::: cpe:2.3:a:microsoft:visual_studio_2022:::::::: cpe:2.3:a:microsoft:visual_studio_2026::::::::
Vendors & Products		Microsoft Microsoft .net Microsoft .net Framework Microsoft visual Studio 2022 Microsoft visual Studio 2026
References		https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70354
Metrics		cvssV3_1 `{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C'}`

Subscriptions

Microsoft .net .net Framework Microsoft Visual Studio 2022 Microsoft Visual Studio 2026 Visual Studio 2022 Visual Studio 2026

MITRE

Status: PUBLISHED

Assigner: microsoft

Published: 2026-08-11T17:07:15.162Z

Updated: 2026-08-14T18:09:47.255Z

Reserved: 2026-08-04T00:04:56.037Z

Link: CVE-2026-70354

Vulnrichment

Updated: 2026-08-12T16:10:53.188Z

NVD

Status : Undergoing Analysis

Published: 2026-08-11T17:19:12.640

Modified: 2026-08-12T17:17:31.000

Link: CVE-2026-70354

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-08-14T12:30:31Z

Weaknesses

CWE-787

Tracking

Attack Vector Local

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction Required

Exploitation none

Automatable no

Technical Impact total

Subscriptions

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