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Microsoft August 2026 Update Breaks When Generating PDF/XPS Content
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Microsoft's August 2026 .NET Framework cumulative updates are causing printing failures and PDF/XPS generation errors in WPF applications. The bug triggers a System.IO.FileFormatException when using ClearType fonts like Calibri, Cambria, Constantia, and Corbel, affecting Windows 10, 11, and Server 2012–2025. The issue stems from stricter font validation in the TrueType subsetter introduced alongside fixes for six security vulnerabilities. A temporary workaround exists but disables the security protections the update introduced.