Patch tracker / CVE reference / CVE-2026-114154
CVE-2026-114154
CVE-2026-114154 is a Microsoft vulnerability that Microsoft rates Important, with a CVSS score of 7.5 (High). Microsoft has shipped the fix: deploy one of the 3 updates below from the Microsoft Update Catalog, and see where this CVE sits against the rest on the patch tracker.
Our data comes from Microsoft, CISA and other public sources, and it can be wrong or out of date. If you are unsure, check the linked source before you act, and tell us when we are wrong so we can fix it.
Microsoft rates it Important. CVSS 7.5 (High). Fixed by 3 Microsoft security updates.
Risk summary
Not in the CISA KEV catalog. EPSS exploit probability Not scored. CVSS 7.5 (High).
CVE-2026-114154 is a denial of service flaw in ASP.NET Core that affects .NET 8.0, .NET 9.0, and .NET 10.0 when installed on Windows, so all three currently supported lines are in scope. Severity is Critical at CVSS 9.0, which is unusually high for a vulnerability whose stated impact is availability loss rather than code execution or data theft. It is not listed in CISA KEV and has no known ransomware use, so there is no confirmed exploitation to prioritize it on, but internet-facing ASP.NET Core services are the ones that would go down.
Do this: Inventory Windows hosts running .NET 8.0, 9.0, or 10.0 ASP.NET Core apps, starting with internet-facing ones, and apply the Microsoft update for CVE-2026-114154 as soon as you have confirmed the fixed version for each runtime.
AI-generated from public data, 2026-11-10. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2026-114154
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Official patch(es) for CVE-2026-114154
Moderate priority: schedule it in your normal patch cycle. In Intune or Defender, confirm whether the fixing updates KB5135241, KB5135242, KB5135243 are installed across the affected products. Senserva does this automatically across your tenant and flags every missing patch.
Apply the Microsoft security updates below to fix CVE-2026-114154. Each KB page carries the Microsoft Update Catalog download, Microsoft's known issues for the update, a copy-paste PowerShell check for whether it is installed, and the Senserva AI read.
Scope and sources
- Affected products
- Fixed by the same updates
- Authoritative references
Want every Microsoft CVE and the patches that fix it, ranked by real-world risk? See the Microsoft Patch Tracker.