CVE-2026-70354

.NET Core Remote Code Execution Vulnerability

Published Aug 11, 2026 CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed

Description

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

Affected Products

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 runtime

affected

Version	Status	Constraints
`10.0.0`	affected	< 10.0.11

Microsoft

.NET 8.0 runtime

affected

Version	Status	Constraints
`8.0.0`	affected	< 8.0.30

Microsoft

.NET 9.0 runtime

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

Configuration 1 [-]

OR	cpe:2.3:a:microsoft:visual_studio_2022::::::::
	cpe:2.3:a:microsoft:visual_studio_2026::::::::

Configuration 2 [-]

AND

cpe:2.3:a:microsoft:.net_framework:4.8.1:*:*:*:*:*:*:*

OR	cpe:2.3:o:microsoft:windows_11_26h1:-::::::arm64:
	cpe:2.3:o:microsoft:windows_11_26h1:-::::::x64:

Configuration 3 [-]

AND

cpe:2.3:a:microsoft:.net_framework:4.8:*:*:*:*:*:*:*

OR	cpe:2.3:o:microsoft:windows_10_1607:-::::::x64:
	cpe:2.3:o:microsoft:windows_10_1607:-::::::x86:
	cpe:2.3:o:microsoft:windows_server_2012:-:::::::*
	cpe:2.3:o:microsoft:windows_server_2012:r2:::::::*
	cpe:2.3:o:microsoft:windows_server_2016:-:::::::*

Configuration 4 [-]

AND

OR	cpe:2.3:a:microsoft:.net_framework:4.6.2:::::::*
	cpe:2.3:a:microsoft:.net_framework:4.7:::::::*
	cpe:2.3:a:microsoft:.net_framework:4.7.1:::::::*
	cpe:2.3:a:microsoft:.net_framework:4.7.2:::::::*

OR	cpe:2.3:o:microsoft:windows_server_2012:-:::::::*
	cpe:2.3:o:microsoft:windows_server_2012:r2:::::::*

Configuration 5 [-]

AND

OR	cpe:2.3:a:microsoft:.net_framework:3.5:-::::::
	cpe:2.3:a:microsoft:.net_framework:4.7.2:::::::*

OR	cpe:2.3:o:microsoft:windows_10_1809:-::::::arm64:
	cpe:2.3:o:microsoft:windows_10_1809:-::::::x64:
	cpe:2.3:o:microsoft:windows_10_1809:-::::::x86:
	cpe:2.3:o:microsoft:windows_server_2019:-:::::::*

Configuration 6 [-]

AND

OR	cpe:2.3:a:microsoft:.net_framework:3.5:-::::::
	cpe:2.3:a:microsoft:.net_framework:4.8.1:::::::*

OR	cpe:2.3:o:microsoft:windows_10_21h2:-::::::arm64:
	cpe:2.3:o:microsoft:windows_10_21h2:-::::::x64:
	cpe:2.3:o:microsoft:windows_10_21h2:-::::::x86:
	cpe:2.3:o:microsoft:windows_10_22h2:-::::::arm64:
	cpe:2.3:o:microsoft:windows_10_22h2:-::::::x64:
	cpe:2.3:o:microsoft:windows_10_22h2:-::::::x86:
	cpe:2.3:o:microsoft:windows_11_23h2:-::::::arm64:
	cpe:2.3:o:microsoft:windows_11_23h2:-::::::x64:
	cpe:2.3:o:microsoft:windows_11_24h2:-::::::arm64:
	cpe:2.3:o:microsoft:windows_11_24h2:-::::::x64:
	cpe:2.3:o:microsoft:windows_11_25h2:-::::::arm64:
	cpe:2.3:o:microsoft:windows_11_25h2:-::::::x64:
	cpe:2.3:o:microsoft:windows_server_2022:-:::::::*
	cpe:2.3:o:microsoft:windows_server_2025:-::::::x64:

Configuration 7 [-]

AND

OR	cpe:2.3:a:microsoft:.net_framework:3.5:-::::::
	cpe:2.3:a:microsoft:.net_framework:4.8:::::::*

OR	cpe:2.3:o:microsoft:windows_10_1809:-::::::arm64:
	cpe:2.3:o:microsoft:windows_10_1809:-::::::x64:
	cpe:2.3:o:microsoft:windows_10_1809:-::::::x86:
	cpe:2.3:o:microsoft:windows_10_21h2:-::::::arm64:
	cpe:2.3:o:microsoft:windows_10_21h2:-::::::x64:
	cpe:2.3:o:microsoft:windows_10_21h2:-::::::x86:
	cpe:2.3:o:microsoft:windows_10_22h2:-::::::arm64:
	cpe:2.3:o:microsoft:windows_10_22h2:-::::::x64:
	cpe:2.3:o:microsoft:windows_10_22h2:-::::::x86:
	cpe:2.3:o:microsoft:windows_server_2019:-:::::::*
	cpe:2.3:o:microsoft:windows_server_2022:-:::::::*

Configuration 8 [-]

AND

OR	cpe:2.3:a:microsoft:.net_framework:3.5:-::::::
	cpe:2.3:a:microsoft:.net_framework:4.6.2:::::::*
	cpe:2.3:a:microsoft:.net_framework:4.7:::::::*
	cpe:2.3:a:microsoft:.net_framework:4.7.1:::::::*
	cpe:2.3:a:microsoft:.net_framework:4.7.2:::::::*

OR	cpe:2.3:o:microsoft:windows_10_1607:-::::::x64:
	cpe:2.3:o:microsoft:windows_10_1607:-::::::x86:
	cpe:2.3:o:microsoft:windows_server_2016:-:::::::*

Configuration 9 [-]

AND

cpe:2.3:a:microsoft:.net_framework:3.5:-:*:*:*:*:*:*

OR	cpe:2.3:o:microsoft:windows_11_26h1:-::::::arm64:
	cpe:2.3:o:microsoft:windows_11_26h1:-::::::x64:
	cpe:2.3:o:microsoft:windows_server_2012:-:::::::*
	cpe:2.3:o:microsoft:windows_server_2012:r2:::::::*

Configuration 10 [-]

AND

OR	cpe:2.3:a:microsoft:.net::::::::
	cpe:2.3:a:microsoft:.net::::::::
	cpe:2.3:a:microsoft:.net::::::::

cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*

No data.

Vendor Product Versions

Microsoft

.net

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

Microsoft

.net

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

Microsoft

.net

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

Microsoft

.net Framework

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

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

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

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

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

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

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

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

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

Microsoft

Microsoft Visual Studio 2026

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

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

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

Metrics

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.

Exploit prediction score: < 1% (0.363% probability within 30 days)

Exploitation none

Automatable no

Technical Impact total

References

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

History

Aug 17, 2026 1:15 PM First appearance in the feed. Affected versions updated. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Microsoft windows Microsoft windows 10 1607 Microsoft windows 10 1809 Microsoft windows 10 21h2 Microsoft windows 10 22h2 Microsoft windows 11 23h2 Microsoft windows 11 24h2 Microsoft windows 11 25h2 Microsoft windows 11 26h1 Microsoft windows Server 2012 Microsoft windows Server 2016 Microsoft windows Server 2019 Microsoft windows Server 2022 Microsoft windows Server 2025
CPEs		cpe:2.3:a:microsoft:.net_framework:3.5:-:::::: cpe:2.3:a:microsoft:.net_framework:4.6.2:::::::* cpe:2.3:a:microsoft:.net_framework:4.7.1:::::::* cpe:2.3:a:microsoft:.net_framework:4.7.2:::::::* cpe:2.3:a:microsoft:.net_framework:4.7:::::::* cpe:2.3:a:microsoft:.net_framework:4.8.1:::::::* cpe:2.3:a:microsoft:.net_framework:4.8:::::::* cpe:2.3:o:microsoft:windows:-:::::::* cpe:2.3:o:microsoft:windows_10_1607:-::::::x64: cpe:2.3:o:microsoft:windows_10_1607:-::::::x86: cpe:2.3:o:microsoft:windows_10_1809:-::::::arm64: cpe:2.3:o:microsoft:windows_10_1809:-::::::x64: cpe:2.3:o:microsoft:windows_10_1809:-::::::x86: cpe:2.3:o:microsoft:windows_10_21h2:-::::::arm64: cpe:2.3:o:microsoft:windows_10_21h2:-::::::x64: cpe:2.3:o:microsoft:windows_10_21h2:-::::::x86: cpe:2.3:o:microsoft:windows_10_22h2:-::::::arm64: cpe:2.3:o:microsoft:windows_10_22h2:-::::::x64: cpe:2.3:o:microsoft:windows_10_22h2:-::::::x86: cpe:2.3:o:microsoft:windows_11_23h2:-::::::arm64: cpe:2.3:o:microsoft:windows_11_23h2:-::::::x64: cpe:2.3:o:microsoft:windows_11_24h2:-::::::arm64: cpe:2.3:o:microsoft:windows_11_24h2:-::::::x64: cpe:2.3:o:microsoft:windows_11_25h2:-::::::arm64: cpe:2.3:o:microsoft:windows_11_25h2:-::::::x64: cpe:2.3:o:microsoft:windows_11_26h1:-::::::arm64: cpe:2.3:o:microsoft:windows_11_26h1:-::::::x64: cpe:2.3:o:microsoft:windows_server_2012:-:::::::* cpe:2.3:o:microsoft:windows_server_2012:r2:::::::* cpe:2.3:o:microsoft:windows_server_2016:-:::::::* cpe:2.3:o:microsoft:windows_server_2019:-:::::::* cpe:2.3:o:microsoft:windows_server_2022:-:::::::* cpe:2.3:o:microsoft:windows_server_2025:-::::::x64:
Vendors & Products		Microsoft windows Microsoft windows 10 1607 Microsoft windows 10 1809 Microsoft windows 10 21h2 Microsoft windows 10 22h2 Microsoft windows 11 23h2 Microsoft windows 11 24h2 Microsoft windows 11 25h2 Microsoft windows 11 26h1 Microsoft windows Server 2012 Microsoft windows Server 2016 Microsoft windows Server 2019 Microsoft windows Server 2022 Microsoft windows Server 2025

Aug 14, 2026 1:00 PM First appearance in the feed. Affected vendors updated View changes

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

Aug 12, 2026 6:30 PM Scoring metrics updated View changes

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

Aug 11, 2026 5:15 PM Description updated. Title updated. First appearance in the feed. Weaknesses updated. Affected versions updated. Affected vendors updated. Added references. Scoring metrics updated View changes

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 Windows Windows 10 1607 Windows 10 1809 Windows 10 21h2 Windows 10 22h2 Windows 11 23h2 Windows 11 24h2 Windows 11 25h2 Windows 11 26h1 Windows Server 2012 Windows Server 2016 Windows Server 2019 Windows Server 2022 Windows Server 2025

Weaknesses