What’s Vulnerable › Vulnerabilities
CVE-2026-18497: The nothings stb TrueType library contains a heap buffer overflow vulnerability
- Severity: high (CVSS 7.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-08-07 · updated 2026-10-23
- Weakness: CWE-122
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.
Affected products
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
- https://github.com/nothings/stb/issues/1905
Get alerted when CVE-2026-18497 or the next vulnerability affects your stack