CVE-2026-18497

CVE-2026-18497 · The nothings stb TrueType library contains a heap buffer overflow vulnerability

This page contains facts from public vulnerability sources. Check the original advisory before updating.

A heap-buffer-overflow vulnerability exists in the nothings stb TrueType library, up to version 1.26, that is used for parsing TrueType font files. The vulnerability exists in the stbtt__GetGlyphShapeTT() function within the nothings stb_truetype.h library when parsing malformed TTF (TrueType Font) files. The vulnerability resides in the glyph data parsing path. An attacker can craft a malformed TTF file with an inflated endPtsOfContours value and truncate the remaining glyph data. When an application utilizing stb_truetype.h (such as various game engines or graphics software) attempts to load, bake, or render this malformed font via stbtt_GetGlyphShape(), the parser will attempt to read past the end of the glyph data buffer, triggering the out-of-bounds read.

CVSS 7.1 · High · EPSS 0.2%

Published

2026-08-07T14:19:42.854Z

Updated

2026-08-12T13:51:47.080Z

Stack: system

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