Microsoft fixed a known issue that caused Windows updates released since May 2025 to fail when installed through WUSA from a network share containing multiple .msu files. The problem affected Windows 11 24H2/25H2 and Windows Server 2025, and is now resolved in June 2026 cumulative updates for KB5079391 and KB5094125. #WUSA #KB5079391 #KB5094125
Keypoints
- Windows updates could fail with ERROR_BAD_PATHNAME when installed via WUSA from a network share.
- The issue affected systems that installed updates released on or after May 28, 2025.
- It mainly impacted Windows 11 24H2/25H2 and Windows Server 2025 enterprise devices.
- Microsoft partially mitigated the bug with Known Issue Rollback for home and non-managed business devices.
- The fix was delivered in June 2026 cumulative updates, and local .msu installs were a workaround.