Vulnerability 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.
References
- 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
FAQ
What is CVE-2026-18497?
CVE-2026-18497 is a documented vulnerability. 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__GetGlyphShape...
How severe is CVE-2026-18497?
CVSS scoring is not yet available for CVE-2026-18497. Check NVD for updates.
Is there a patch for CVE-2026-18497?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.