The nothings stb TrueType library contains a heap buffer overflow vulnerability

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Summary

CVECVE-2026-18497
StatePUBLISHED
Assignercertcc
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-07 15:16:59 UTC
Updated2026-08-07 16:17:22 UTC
DescriptionA 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.

Risk And Classification

EPSS: 0.001570000 probability, percentile 0.052930000 (date 2026-08-09)

Problem Types: CWE-122: Heap-based Buffer Overflow

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Sean Barrett Nothings Nothings Stb affected 1.26 Not specified

References

ReferenceSourceLinkTags
github.com/nothings/stb [email protected] github.com
kb.cert.org/vuls/id/987105 [email protected] kb.cert.org
www.kb.cert.org/vuls/id/987105 af854a3a-2127-422b-91ae-364da2661108 www.kb.cert.org
cwe.mitre.org/data/definitions/122.html [email protected] cwe.mitre.org
github.com/nothings/stb/issues/1905 [email protected] github.com
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