CVE-2026-69651ImportantDoSNetwork
.NET Denial of Service Vulnerability
Assessment
Inefficient algorithmic complexity in .NET allows an unauthorized attacker to deny service over a network.
- Severity
- Important
- CVSS base score
- 7.5CVSS:3.1/
AV:N/ AC:L/ PR:N/ UI:N/ S:U/ C:N/ I:N/ A:H/ E:U/ RL:O/ RC:C - Impact
- Denial of Service
- EPSS, next 30 days
- Not scored yet
- Public exploit code
- No Nuclei template lists it
- Exploitability
- Exploitation Less Likely
- Publicly disclosed
- No
- Customer action
- Required: apply the update
- Component
- .NET
- Weakness
- CWE-407: Inefficient Algorithmic Complexity
- Issued by
- Microsoft
- Published
- 13 Oct 2026 · October 2026
- Last revised
- 13 Oct 2026
CVSS 3.1 base metricsRed raises the risk · green lowers it
- Attack vector
- NetworkAV:N
- Attack complexity
- LowAC:L
- Privileges required
- NonePR:N
- User interaction
- NoneUI:N
- Scope
- UnchangedS:U
- Confidentiality
- NoneC:N
- Integrity
- NoneI:N
- Availability
- HighA:H
Updates that fix it
22 KBs| KB | Type | Applies to | Other CVEs |
|---|---|---|---|
| KB5126868 | Security Update | Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 version 1607, Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016 | All CVEs in KB5126868 |
| KB5127660 | Security Update | Microsoft .NET Framework 3.5 on Windows Server 2012 | All CVEs in KB5127660 |
| KB5127664 | Security Update | Microsoft .NET Framework 3.5 on Windows Server 2012 R2 | All CVEs in KB5127664 |
| KB5127666 | Security Update | Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2019, Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 version 1809 | All CVEs in KB5127666 |
| KB5127667 | Security Update | Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 | All CVEs in KB5127667 |
| KB5127668 | Security Update | Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2 | All CVEs in KB5127668 |
| KB5127683 | Security Update | Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 21H2, Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 22H2 | All CVEs in KB5127683 |
| KB5127684 | Security Update | Microsoft .NET Framework 4.8 on Windows 10 version 1607, Microsoft .NET Framework 4.8 on Windows Server 2016 | All CVEs in KB5127684 |
| KB5127685 | Security Update | Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 1809, Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019 | All CVEs in KB5127685 |
| KB5127686 | Security Update | Microsoft .NET Framework 4.8 on Windows Server 2012 | All CVEs in KB5127686 |
| KB5127687 | Security Update | Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022 | All CVEs in KB5127687 |
| KB5127688 | Security Update | Microsoft .NET Framework 4.8 on Windows Server 2012 R2 | All CVEs in KB5127688 |
| KB5127689 | Security Update | Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 21H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 22H2 | All CVEs in KB5127689 |
| KB5127690 | Security Update | Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 24H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 25H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2025 | All CVEs in KB5127690 |
| KB5127691 | Security Update | Microsoft .NET Framework 4.8.1 on Windows 11 version 26H1 | All CVEs in KB5127691 |
| KB5127692 | Security Update | Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 23H2 | All CVEs in KB5127692 |
| KB5127693 | Security Update | Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2022 | All CVEs in KB5127693 |
| KB5127694 | Security Update | Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 26H2 | All CVEs in KB5127694 |
| KB5127696 | Security Update | Microsoft .NET Framework 3.5 on Windows 11 version 26H1 | All CVEs in KB5127696 |
| KB5130034 | Security Update | .NET 8.0 installed on Linux, .NET 8.0 installed on Mac OS, .NET 8.0 installed on Windows | All CVEs in KB5130034 |
| KB5130035 | Security Update | .NET 9.0 installed on Linux, .NET 9.0 installed on Mac OS, .NET 9.0 installed on Windows | All CVEs in KB5130035 |
| KB5130036 | Security Update | .NET 10.0 installed on Linux, .NET 10.0 installed on Mac OS, .NET 10.0 installed on Windows | All CVEs in KB5130036 |
Affected products
Developer Tools41 affected products
- .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
- Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 version 1607
- Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016
- Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2019
- Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 version 1809
- Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 1809
- Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 21H2
- Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 22H2
- Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019
- Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022
- Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 21H2
- Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 22H2
- Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 23H2
- Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 24H2
- Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 25H2
- Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 26H2
- Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2022
- Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2025
- Microsoft .NET Framework 3.5 on Windows 11 version 26H1
- Microsoft .NET Framework 3.5 on Windows Server 2012
- Microsoft .NET Framework 3.5 on Windows Server 2012 R2
- Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012
- Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2
- Microsoft .NET Framework 4.8 on Windows 10 version 1607
- Microsoft .NET Framework 4.8 on Windows Server 2012
- Microsoft .NET Framework 4.8 on Windows Server 2012 R2
- Microsoft .NET Framework 4.8 on Windows Server 2016
- Microsoft .NET Framework 4.8.1 on Windows 11 version 26H1
- Microsoft Visual Studio 2022 version 17.14
- Microsoft Visual Studio 2026 version 18.10
What changed
First observed 14 Oct 2026No field changes in the recorded history.
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