202310 Cumulative Update For Windows 11 For X64based Systems Kb5031358 Exclusive Jun 2026

where it stopped responding when trying to share a file as a PDF through Outlook. Installation Details : x64-based systems (and ARM64). Availability

requirements, a Chinese national standard for character encoding. Regional Adjustments Updated the spelling of Ukraine’s capital from Kiev to Kyiv Included support for daylight saving time (DST) changes in Greenland. Enhanced Security Protocols Introduced new registry keys to protect against CVE-2023-44487 where it stopped responding when trying to share

As a "Patch Tuesday" release, KB5031358 was critical for system integrity. It addressed several high-priority security concerns, including —most notably CVE-2023-44487, an HTTP/2 "Rapid Reset" attack that could lead to DDoS conditions. By patching these flaws, Microsoft provided a final layer of protection for users on the original 2021 release of Windows 11. Key Functional Improvements By patching these flaws, Microsoft provided a final

While many users received KB5031358 as a standard "Patch Tuesday" update, the "exclusive" label sometimes indicated that it was initially reserved for enterprise users, administrators using Microsoft Update Catalog, or Windows Server Update Services (WSUS). This allowed IT teams to test the update before broad consumer deployment. improving character set support.

Or via winver –

: It updated the system to comply with GB18030-2022 requirements, improving character set support.