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The cumulative update KB5066835 released last week for Windows 11 versions 24H2 and 25H2 introduced several serious issues, including a bug preventing developers from accessing local network addresses (localhost) and another that rendered keyboards and mice unusable in the Windows Recovery Environment (WinRE).
Microsoft has already addressed the localhost access issue through its Known Issue Rollback (KIR) mechanism, effectively reversing the problematic change and restoring developer access to localhost and 127.0.0.1. However, the WinRE input failure requires an out-of-band (OOB) emergency update to be fully resolved.
The recovery environment serves as Windows NT’s final line of defense for repairing critical system failures. Within WinRE, users can uninstall recent updates, initiate system restore, reset or repair the system, or boot into Safe Mode.
Unfortunately, due to the KB5066835 bug, users entering WinRE found themselves unable to use USB-connected keyboards or mice, rendering all recovery options inaccessible. In practice, this left affected users trapped on the recovery screen, forced to shut down their systems manually. Only those with older PS/2-connected peripherals remained unaffected.
To address this severe issue, Microsoft has released the emergency out-of-band update KB5070773, which is now being automatically deployed to all users. Systems that are still operational and connected to the internet will automatically install the patch, ensuring that WinRE remains functional in the event of future failures.
For those who wish to apply the patch manually, it can be downloaded directly from the Microsoft Update Catalog.
However, users who are already stuck within the recovery environment face a far more difficult situation. Without the ability to interact with WinRE or boot into Windows to install the fix, there is no practical recovery method—a troubling deadlock until Microsoft provides an alternative solution.
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