CVE-2026-18497

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.

• CWE-122

• https://cwe.mitre.org/data/definitions/122.html
• https://github.com/nothings/stb
• https://github.com/nothings/stb/issues/1905
• https://kb.cert.org/vuls/id/987105
• https://www.kb.cert.org/vuls/id/987105
• https://github.com/nothings/stb/issues/1905

Published

Aug 7, 2026

Last Modified

Aug 12, 2026

Status

Received

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