CVE-2026-114149: ASP.NET Core Denial of Service Vulnerability
CVE-2026-114149 is a denial of service vulnerability in ASP.NET Core, rated Important by Microsoft, with a CVSS 3.1 base score of 7.5 (High). An attacker can exploit it remotely over the network, without any privileges and without user interaction. Microsoft has not reported exploitation in the wild and rates exploitation as less likely. Microsoft released the fix on 10 November 2026 in the November 2026 Patch Tuesday, delivered through 3 security updates (KB5135243, KB5135242, KB5135241). It affects 16 products in 2 product families (Developer Tools, Other).
Key facts
- CVE ID
- CVE-2026-114149
- Severity
- High CVSS 7.5
- Microsoft severity
- Important
- Impact
- Denial of Service
- Exploited in the wild
- No
- Publicly disclosed
- No
- Exploitation likelihood
- Less Likely
- CISA KEV
- Not listed
- Released
- Last updated
- Patch Tuesday
- November 2026 Patch Tuesday
- Product families
- Developer Tools, Other
CVSS score and vector
Microsoft scores CVE-2026-114149 at 7.5 (temporal 6.5) using CVSS 3.1. 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
| Metric | Value |
|---|---|
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality impact | None |
| Integrity impact | None |
| Availability impact | High |
| Exploit code maturity | Unproven |
| Remediation level | Official fix |
| Report confidence | Confirmed |
Description
Uncontrolled resource consumption in ASP.NET Core allows an unauthorized attacker to deny service over a network.
Affected products (16)
Developer Tools
| Product | Security update | Type | Fixed build | Restart |
|---|---|---|---|---|
| .NET 8.0 installed on Windows | KB5135243 | Security Update | 8.0.34 | |
| .NET 8.0 installed on Linux | KB5135243 | Security Update | 8.0.34 | |
| .NET 8.0 installed on Mac OS | KB5135243 | Security Update | 8.0.34 | |
| .NET 9.0 installed on Windows | KB5135242 | Security Update | 9.0.23 | |
| .NET 9.0 installed on Linux | KB5135242 | Security Update | 9.0.23 | |
| .NET 9.0 installed on Mac OS | KB5135242 | Security Update | 9.0.23 | |
| .NET 10.0 installed on Windows | KB5135241 | Security Update | 10.0.15 | |
| .NET 10.0 installed on Linux | KB5135241 | Security Update | 10.0.15 | |
| .NET 10.0 installed on Mac OS | KB5135241 | Security Update | 10.0.15 | |
| .NET 11.0 installed on Windows | Release Notes | Security Update | 11.0.0 | |
| .NET 11.0 installed on Linux | Release Notes | Security Update | 11.0.0 | |
| .NET 11.0 installed on Mac OS | Release Notes | Security Update | 11.0.0 | |
| Microsoft Visual Studio 2022 version 17.14 | Release Notes | Security Update | 17.14.45 | Yes |
| Microsoft Visual Studio 2026 version 18.11 | Release Notes | Security Update | 18.11.4 | |
| Microsoft Visual Studio 2026 version 18.12 | Release Notes | Security Update | 18.12.0 |
Other
| Product | Security update | Type | Fixed build | Restart |
|---|---|---|---|---|
| Microsoft.AspNetCore.WebUtilities | Release Notes | Security Update | 10.0.15 |
Security updates (3)
Acknowledgments
Revision history
| Version | Date | Description |
|---|---|---|
| 1.0 | Information published. |