Update Details
2026-05 .NET Framework 3.5 Security Update (KB5087077) UUP
Last Modified:
5/12/2026
Size:
100.4 MB
UpdateID:
c205bbc3-1ac6-40d4-9a52-2d7b134c7f7e
If you have a pop-up blocker enabled, the Download window might not open. To open the Download window, configure your pop-blocker to allow pop-ups for this Web site.
Details:
Overview
Language Selection
Package Details
Install Resources
Description:
This security update addresses vulnerabilities in .NET Framework 3.5. For more information about this update, see KB5087077 (https://support.microsoft.com/en-us/kb/5087077).
Architecture:
n/a
Classification:
Security Updates
Supported products:
.NET Framework 3.5
Supported languages:
all
MSRC Number:
n/a
MSRC severity:
Important
KB article numbers:
5087077
More information:
https://go.microsoft.com/fwlink/?linkid=2348700
Support Url:
https://go.microsoft.com/fwlink/?linkid=2349806
This update has been replaced by the following updates:
2026-07 .NET Framework 3.5 Security Update (KB5101014) UUP
This update replaces the following updates:
n/a
There are no additional languages to select
Restart behavior:
Can request restart
May request user input:
No
Must be installed exclusively:
Requires network connectivity:
No
Uninstall Notes:
n/a
Uninstall Steps:
n/a
Add to Basket
Remove from Basket
Update Basket
Close