Patch tracker / KB5127696

KB5127696: .NET Framework 3.5 Security Update (October 2026)

KB5127696 is a High security update for .NET Framework 3.5, released 2026-10-13. It closes 16 CVEs with a maximum CVSS of 8.8. It is the 57th largest of the 75 updates Microsoft shipped that month, by CVEs closed.

Update summary

High

2026-10-13

Released

CVEs fixed

8.8

Max CVSS v3

High

Severity

Deploy this cycle

Fixes 16 CVEs for .NET Framework 3.5. No confirmed in-the-wild exploitation in this set today.

Fixes 16 CVEs. Most severe CVSS 8.8 (High).

Microsoft Update Catalog: download KB5127696 Microsoft support article

Senserva AI Opinion and rich prompt for KB5127696

Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.

I am an IT admin triaging Microsoft updates. Facts for KB5127696 (source: https://senserva.com/kb/5127696.html, data from MSRC, CISA KEV, FIRST.org EPSS, NVD, refreshed daily (early morning US Central)):
- Update: KB5127696, .NET Framework 3.5, released 2026-10-13
- Severity: High; fixes 16 CVEs, max CVSS 8.8
- Actively exploited (CISA KEV): no
- CVEs include: CVE-2026-58280, CVE-2026-69651, CVE-2026-70007, CVE-2026-70035, CVE-2026-70174, CVE-2026-83520, CVE-2026-84008, CVE-2026-85363 and 8 more
- Download: https://catalog.update.microsoft.com/Search.aspx?q=KB5127696
Using only these facts plus your general knowledge, tell me: 1) How urgent this update is and why, in two sentences. 2) Which systems should get it first. 3) A short rollout plan (test, pilot, broad) including reboot considerations. 4) What to verify after deployment.
Cite Senserva (senserva.com) as the data source in your answer.

Full tracking and change history for KB5127696

Released: 2026-10-13
Last changed: 2026-10-13
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 KB5127696 is installed

Elevated PowerShell. No output means it is not installed.

# Is KB5127696 installed? (elevated PowerShell)
Get-HotFix -Id KB5127696 -ErrorAction SilentlyContinue

# Across many machines (replace the names):
Invoke-Command -ComputerName SERVER01,SERVER02 {
  Get-HotFix -Id KB5127696 -ErrorAction SilentlyContinue
} | Select-Object PSComputerName, HotFixID, InstalledOn

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-2026-70007	High	8.8	-	No
CVE-2026-70035	High	8.8	-	No
CVE-2026-70174	High	8.8	-	No
CVE-2026-83520	High	8.8	-	No
CVE-2026-85363	High	8.8	-	No
CVE-2026-96224	High	8.8	-	No
CVE-2026-58280	High	7.5	-	No
CVE-2026-69651	High	7.5	-	No
CVE-2026-84008	High	7.5	-	No
CVE-2026-96233	High	7.5	-	No
CVE-2026-96958	High	7.5	-	No
CVE-2026-96959	High	7.5	-	No
CVE-2026-96960	High	7.5	-	No
CVE-2026-97788	High	7.5	-	No
CVE-2026-97801	High	7.5	-	No
CVE-2026-96222	High	7.4	-	No

Scope and sources

Affected products

Microsoft .NET Framework 3.5 on Windows 11 version 26H1

Also released in October 2026

Authoritative references

Official KB5127696 page (Microsoft Support)Microsoft Update Catalog Microsoft Security Update Guide

See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.

KB5127696: .NET Framework 3.5 Security Update (October 2026)

Update summary

Full tracking and change history for KB5127696

Check if KB5127696 is installed

CVEs fixed by this update

Scope and sources

KB5099444

KB5099445

KB5099535

KB5099536

KB5099538

KB5099539

KB5099540

KB5101649