Samsung Update Breaks Third-Party Fonts on Galaxy Phones

Samsung's March 2026 security update has disrupted custom font functionality on Galaxy smartphones, leaving many users unable to access personalized text styles installed through third-party applications.

The issue surfaced shortly after the update rolled out earlier this month, with reports from Galaxy owners on forums including Reddit and XDA Developers. Affected devices run either One UI 8 or One UI 8.5, Samsung's customized version of Android. Users described installing the patch only to find their custom fonts inaccessible. Attempts to switch to a third-party font trigger an error message stating, "This font is not supported. Contact the font provider. Uninstall this font?" with options to cancel or delete the font. In some cases, switching away from a custom font and back renders it permanently unusable, even if it initially survived the update.

The problem stems from a deliberate change in the update rather than an unintended glitch. Samsung addressed a security vulnerability tracked as CVE-2026-20989, rated moderate severity. The flaw involved improper verification of cryptographic signatures in the Font Settings feature, which prior to the March 2026 Security...