GoKawiilRyan Haines / Android Authority
TL;DR Samsung’s March 2026 security patch has broken custom fonts for some users.
The broken custom fonts might be due to Samsung fixing a font-related flaw on its phones.
Galaxy owners can still apparently download custom fonts via the Galaxy Store, though.
Like many Android OEMs, Samsung lets you switch to custom fonts on your phone. This is great if you’re not feeling the default font styles for some reason or if you simply want a fresh look. Unfortunately, it sounds like a recent update is breaking this functionality.
Samsung owners on Reddit (1, 2) have reported that they effectively lost custom fonts after updating to the March 2026 security patch. The issue seems to affect users on both One UI 8.5 and One UI 8.
Affected users found that they couldn’t switch to a custom font. Furthermore, some users found that switching from a custom font to another font rendered the initial custom font unusable. Galaxy owners also reported seeing an error message, as seen in the screenshot below.
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So what could be the cause of the issue? PiunikaWeb took a closer look at the March 2026 security patch notes and found a potential culprit in patched vulnerability CVE-2026-20989.
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