Patch tracker / KB5135242
KB5135242: .NET 9.0 installed Security Update (November 2026)
KB5135242 is a Critical security update for .NET 9.0 installed, released 2026-11-10. It closes 14 CVEs with a maximum CVSS of 9.0. It is the 23rd largest of the 27 updates Microsoft shipped that month, by CVEs closed.
Our data comes from Microsoft, CISA and other public sources, and it can be wrong or out of date.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.
Update summary
Fixes 14 CVEs. Most severe CVSS 9.0 (Critical). EPSS exploit probability up to <1%. Among the lower half of tracked Microsoft updates by EPSS exploit probability.
KB5135242 is the November 2026 servicing update for .NET 9.0, shipped for Windows, Linux, and macOS runtimes alike, and it addresses 13 CVEs with a highest Severity of Critical (CVSS 9.0). Because it covers all three platforms, any server, build agent, container host, or developer workstation running a .NET 9.0 runtime or SDK is in scope, not just Windows fleets. None of the CVEs are in the CISA KEV catalog or tied to ransomware, so this is a patch-soon priority driven by the Critical score rather than known active exploitation.
Do this: Inventory every host and container image running .NET 9.0 across Windows, Linux, and macOS, and roll KB5135242 out to internet-facing and CI/build systems first.
AI-generated from public data, 2026-11-10. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5135242
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5135242
- Released
- 2026-11-10
- Last changed
- 2026-11-10
- Changes tracked
- 1
Senserva began recording day-to-day change history on 2026-07-07, and refreshes it several times a day. Release dates are historical where Microsoft publishes them; revision history is tracked from that date forward, so it does not include changes made before then.
Check if KB5135242 is installed
This update is for .NET 9.0 installed on Windows, not a Windows component, so Get-HotFix does not list it. Compare the installed version of the product with the build Microsoft lists for this update.
CVEs fixed by this update
Sorted exploited-first, then by CVSS. Every CVE links to its Senserva page with the full risk facts, references, and a ready-to-paste AI prompt.
| CVE | Severity | CVSS | EPSS | Exploited |
|---|---|---|---|---|
| CVE-2026-114146 | Critical | 9.0 | - | No |
| CVE-2026-114151 | High | 8.8 | - | No |
| CVE-2026-114152 | High | 8.8 | - | No |
| CVE-2026-114158 | High | 8.8 | - | No |
| CVE-2026-114159 | High | 8.8 | - | No |
| CVE-2026-118745 | High | 8.8 | - | No |
| CVE-2026-70175 | High | 8.1 | <1% | No |
| CVE-2026-105544 | High | 7.5 | - | No |
| CVE-2026-109475 | High | 7.5 | - | No |
| CVE-2026-114147 | High | 7.5 | - | No |
| CVE-2026-114149 | High | 7.5 | - | No |
| CVE-2026-114154 | High | 7.5 | - | No |
| CVE-2026-114157 | High | 7.5 | - | No |
| CVE-2026-109476 | Medium | 6.1 | - | No |
Scope and sources
- Affected products
- Also released in November 2026
KB5002945
24 CVEs · CriticalKB5129299
57 CVEs · CriticalKB5129300
54 CVEs · CriticalKB5131077
625 CVEs · CriticalKB5131080
627 CVEs · CriticalKB5131085
575 CVEs · CriticalKB5131087
574 CVEs · CriticalKB5131090
592 CVEs · CriticalThe full month, summarized: Microsoft Patch Tuesday.
- Authoritative references
See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.