Patch tracker / KB5135243
KB5135243: .NET 8.0 installed Security Update (November 2026)
KB5135243 is a Critical security update for .NET 8.0 installed, released 2026-11-10. It closes 15 CVEs with a maximum CVSS of 9.0. It is the 21st largest of the 27 updates Microsoft shipped that month, by CVEs closed.
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Update summary
Fixes 15 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.
KB5135243 is the November 2026 .NET 8.0 update, shipped for Windows, Linux and Mac OS in one release, and it fixes 14 CVEs with a Highest Severity of Critical (CVSS 9.0). None of the CVEs are in CISA KEV or linked to ransomware, so there is no sign of active exploitation yet. It matters now because .NET 8.0 is a runtime that servers, containers and developer machines often carry without central tracking, so exposure can sit outside normal Windows patch reporting.
Do this: Inventory every host and container image running .NET 8.0 on Windows, Linux and Mac OS, then deploy KB5135243 to the Critical-exposed internet-facing and server workloads first and rebuild any images that bundle the runtime.
AI-generated from public data, 2026-11-10. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5135243
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5135243
- 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 KB5135243 is installed
This update is for .NET 8.0 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-2026-109478 | 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.