CVE-2026-96958

.NET Denial of Service Vulnerability

Published Oct 13, 2026 CVSS 3.1 · 7.5 High EPSS 1.2% KEV · Not listed

Description

Inefficient algorithmic complexity in .NET allows an unauthorized attacker to deny service over a network.

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

Microsoft .NET Framework 3.5

affected

Version	Status	Constraints
`3.5.0`	affected	< 2.0.50727.9188 AND 3.0.30729.9171

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	< 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0

Microsoft

Microsoft .NET Framework 3.5 AND 4.7.2

affected

Version	Status	Constraints
`4.7.0`	affected	< 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0

Microsoft

Microsoft .NET Framework 3.5 AND 4.8

affected

Version	Status	Constraints
`4.8.0`	affected	< 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0

Microsoft

Microsoft .NET Framework 3.5 AND 4.8.1

affected

Version	Status	Constraints
`4.8.1`	affected	< 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0

Microsoft

Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2

affected

Version	Status	Constraints
`4.7.0`	affected	< 4.7.4150.0

Microsoft

Microsoft .NET Framework 4.8

affected

Version	Status	Constraints
`4.8.0`	affected	< 4.8.4811.0

Microsoft

Microsoft .NET Framework 4.8.1

affected

Version	Status	Constraints
`4.8.0.0`	affected	< 4.8.9363.0

Microsoft

System.Security.Cryptography.Xml

affected

Version	Status	Constraints
`10.0.0`	affected	< 10.0.13

Configuration 1 [-]

AND

OR	cpe:2.3:a:microsoft:.net::::::::
	cpe:2.3:a:microsoft:.net::::::::
	cpe:2.3:a:microsoft:.net::::::::
	cpe:2.3:a:microsoft:.net:11.0.0:preview1::::::
	cpe:2.3:a:microsoft:.net:11.0.0:preview2::::::
	cpe:2.3:a:microsoft:.net:11.0.0:preview3::::::
	cpe:2.3:a:microsoft:.net:11.0.0:preview4::::::
	cpe:2.3:a:microsoft:.net:11.0.0:preview5::::::
	cpe:2.3:a:microsoft:.net:11.0.0:preview6::::::
	cpe:2.3:a:microsoft:.net:11.0.0:preview7::::::
	cpe:2.3:a:microsoft:.net:11.0.0:rc1::::::

OR	cpe:2.3:o:apple:macos:-:::::::*
	cpe:2.3:o:linux:linux_kernel:-:::::::*
	cpe:2.3:o:microsoft:windows:-:::::::*

Configuration 2 [-]

AND

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

cpe:2.3:o:microsoft:windows_11_26h1:-:*:*:*:*:*:*:*

Configuration 3 [-]

AND

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

OR	cpe:2.3:o:microsoft:windows_10_1607:-:::::::*
	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:4.8.1:::::::*

OR	cpe:2.3:o:microsoft:windows_10_21h2:-:::::::*
	cpe:2.3:o:microsoft:windows_10_22h2:-:::::::*
	cpe:2.3:o:microsoft:windows_11_23h2:-:::::::*
	cpe:2.3:o:microsoft:windows_11_24h2:-:::::::*
	cpe:2.3:o:microsoft:windows_11_25h2:-:::::::*
	cpe:2.3:o:microsoft:windows_11_26h2:-:::::::*
	cpe:2.3:o:microsoft:windows_server_2022:-:::::::*
	cpe:2.3:o:microsoft:windows_server_2025:-:::::::*

Configuration 6 [-]

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:-:::::::*
	cpe:2.3:o:microsoft:windows_10_21h2:-:::::::*
	cpe:2.3:o:microsoft:windows_10_22h2:-:::::::*
	cpe:2.3:o:microsoft:windows_server_2019:-:::::::*
	cpe:2.3:o:microsoft:windows_server_2022:-:::::::*

Configuration 7 [-]

AND

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

cpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:*:*

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:-:::::::*
	cpe:2.3:o:microsoft:windows_server_2016:-:::::::*
	cpe:2.3:o:microsoft:windows_server_2019:-:::::::*

Configuration 9 [-]

AND

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

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

No data.

Vendor Product Versions

Microsoft

.net Framework

Version	Status	Scheme	Platform
`[3.5.0,2.0.50727.9188)`	affected	generic	['windows_11_version_26h1', 'windows_server_2012', 'windows_server_2012_r2']

Microsoft

.net Framework

Version	Status	Scheme	Platform
`[3.0.0.0,2.0.50727.8987)`	affected	generic	['windows_10_version_1607', 'windows_server_2016', 'windows_server_2019']

Microsoft

.net Framework

Version	Status	Scheme	Platform
`[4.7.0,2.0.50727.9073)`	affected	generic	['windows_10_version_1809']

Microsoft

.net Framework

Version	Status	Scheme	Platform
`[4.8.0,2.0.50727.9073)`	affected	generic	['windows_10_version_1809', 'windows_10_version_21h2', 'windows_10_version_22h2', 'windows_server_2019', 'windows_server_2022']

Microsoft

.net Framework

Version	Status	Scheme	Platform
`[4.8.1,2.0.50727.9188)`	affected	generic	['windows_10_version_21h2', 'windows_10_version_22h2', 'windows_11_version_23h2', 'windows_11_version_24h2', 'windows_11_version_25h2', 'windows_11_version_26h2', 'windows_server_2022', 'windows_server_2025']

Microsoft

.net Framework

Version	Status	Scheme	Platform
`[4.7.0,4.7.4150.0)`	affected	generic	['windows_server_2012', 'windows_server_2012_r2']

Microsoft

.net Framework

Version	Status	Scheme	Platform
`[4.8.0,4.8.4811.0)`	affected	generic	['windows_10_version_1607', 'windows_server_2012', 'windows_server_2012_r2', 'windows_server_2016']

Microsoft

.net Framework

Version	Status	Scheme	Platform
`[4.8.0.0,4.8.9363.0)`	affected	generic	['windows_11_version_26h1']

Microsoft

System.security.cryptography.xml

Version	Status	Scheme	Platform
`[10.0.0,10.0.13)`	affected	semver	['.net_10.0_installed_on_linux', '.net_10.0_installed_on_mac_os', '.net_10.0_installed_on_windows', '.net_11.0_installed_on_linux', '.net_11.0_installed_on_mac_os', '.net_11.0_installed_on_windows', '.net_8.0_installed_on_linux', '.net_8.0_installed_on_mac_os', '.net_8.0_installed_on_windows', '.net_9.0_installed_on_linux', '.net_9.0_installed_on_mac_os', '.net_9.0_installed_on_windows']

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

Source	ID	Title
Github GHSA	GHSA-r955-8q5j-3h83	Microsoft Security Advisory CVE-2026-96958 - .NET and Visual Studio Denial of Service Vulnerability

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: 1.2% (1.203% probability within 30 days)

Exploitation none

Automatable yes

Technical Impact partial

References

Link	Providers
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96958

History

Oct 16, 2026 7:45 PM First appearance in the feed. Affected versions updated. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Apple Apple macos Linux Linux linux Kernel 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 11 26h2 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:11.0.0:preview1:::::: cpe:2.3:a:microsoft:.net:11.0.0:preview2:::::: cpe:2.3:a:microsoft:.net:11.0.0:preview3:::::: cpe:2.3:a:microsoft:.net:11.0.0:preview4:::::: cpe:2.3:a:microsoft:.net:11.0.0:preview5:::::: cpe:2.3:a:microsoft:.net:11.0.0:preview6:::::: cpe:2.3:a:microsoft:.net:11.0.0:preview7:::::: cpe:2.3:a:microsoft:.net:11.0.0:rc1:::::: 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:apple:macos:-:::::::* cpe:2.3:o:linux:linux_kernel:-:::::::* cpe:2.3:o:microsoft:windows:-:::::::* cpe:2.3:o:microsoft:windows_10_1607:-:::::::* cpe:2.3:o:microsoft:windows_10_1809:-:::::::* cpe:2.3:o:microsoft:windows_10_21h2:-:::::::* cpe:2.3:o:microsoft:windows_10_22h2:-:::::::* cpe:2.3:o:microsoft:windows_11_23h2:-:::::::* cpe:2.3:o:microsoft:windows_11_24h2:-:::::::* cpe:2.3:o:microsoft:windows_11_25h2:-:::::::* cpe:2.3:o:microsoft:windows_11_26h1:-:::::::* cpe:2.3:o:microsoft:windows_11_26h2:-:::::::* 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:-:::::::*
Vendors & Products		Apple Apple macos Linux Linux linux Kernel 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 11 26h2 Microsoft windows Server 2012 Microsoft windows Server 2016 Microsoft windows Server 2019 Microsoft windows Server 2022 Microsoft windows Server 2025

Oct 13, 2026 9:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Oct 13, 2026 7:15 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		Inefficient algorithmic complexity in .NET allows an unauthorized attacker to deny service over a network.
Title		.NET Denial of Service Vulnerability
First Time appeared		Microsoft Microsoft .net Microsoft .net Framework Microsoft system.security.cryptography.xml
Weaknesses		CWE-407
CPEs		cpe:2.3:a:microsoft:.net:::::::: cpe:2.3:a:microsoft:.net_framework:::::::: cpe:2.3:a:microsoft:system.security.cryptography.xml::::::::
Vendors & Products		Microsoft Microsoft .net Microsoft .net Framework Microsoft system.security.cryptography.xml
References		https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96958
Metrics		cvssV3_1 `{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C'}`

Subscriptions

Apple Macos

Linux Linux Kernel

Microsoft .net .net Framework System.security.cryptography.xml 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 11 26h2 Windows Server 2012 Windows Server 2016 Windows Server 2019 Windows Server 2022 Windows Server 2025

Weaknesses