# Microsoft confirms August .NET updates can break WPF printing and PDF export

_Monday, August 24, 2026 at 8:40 AM EDT · Products, Security · Developing · Tier 2 — Notable_

![Microsoft confirms August .NET updates can break WPF printing and PDF export — Primary](https://www.bleepstatic.com/content/hl-images/2026/08/24/Printer-printing-error.jpg)

Microsoft confirmed that August 2026 .NET Framework cumulative updates can cause some Windows Presentation Foundation applications to fail when printing or generating PDF/XPS content using certain fonts, including Calibri.

The issue affects Windows client releases and Windows Server versions from 2012 through 2025. Microsoft provided a temporary application-configuration workaround while it investigates a permanent fix. The company warned that enabling the workaround disables protections introduced in the August update and can expose systems to attacks addressed by that month's security fixes.

## Sources

- [BleepingComputer](https://www.bleepingcomputer.com/news/microsoft/microsoft-august-updates-break-printing-pdf-export-in-wpf-apps/)

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Retrieved: 2026-08-24T14:38:00.357Z
Publisher: Tech & Business (techandbusiness.org)