Microsoft rushes an out-of-band update for Message Queuing bug

Microsoft issued an out-of-band patch to resolve a regression in **Message Queuing (MSMQ)** introduced by the December 2025 Windows updates, which disrupted enterprise services (e.g., IIS and queue-dependent apps) on Windows 10 ESU/LTSC/LTSB and Windows Server 2008–2019; the problem stemmed from a change requiring MSMQ write access to restricted locations, triggering failures and misleading "insufficient disk space or memory" logs—after acknowledging the issue on December 12, 2025, Microsoft recommended applying the OOB update rather than workarounds (permission changes or rollback), highlighting QA shortcomings rather than a security vulnerability or attack.