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.
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Affected Vendors & Products
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| Sean Barrett |
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| Sean Barrett |
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References
History
Sat, 08 Aug 2026 21:00:00 +0000
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| First Time appeared |
Sean Barrett
Sean Barrett nothings Stb |
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| Vendors & Products |
Sean Barrett
Sean Barrett nothings Stb |
Fri, 07 Aug 2026 15:45:00 +0000
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| Weaknesses | CWE-122 |
Fri, 07 Aug 2026 14:45:00 +0000
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| Description | 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. | |
| Title | The nothings stb TrueType library contains a heap buffer overflow vulnerability | |
| References |
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MITRE
Status: PUBLISHED
Assigner: certcc
Published:
Updated: 2026-08-07T15:17:50.021Z
Reserved: 2026-07-31T15:58:31.185Z
Link: CVE-2026-18497
Vulnrichment
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NVD
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Redhat
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OpenCVE Enrichment
Updated: 2026-08-08T20:40:59Z