kb5094125

KB5094125 is a Windows Server 2025 update from Microsoft's June 2026 Patch Tuesday that permanently fixes a Windows Update Standalone Installer failure, specifically the WUSA ERROR_BAD_PATHNAME error. This error affected administrators who stage .msu packages on network shares, causing a year-long workaround. The corresponding fix for Windows 11 24H2 and 25H2 arrived earlier in the March 24 preview update KB5079391. The distinction highlights how enterprise patching relies on legacy infrastructure that can break unexpectedly. For IT professionals managing Windows Server environments, KB5094125 resolves a persistent issue that disrupted patching workflows.