CVE-2026-18497
HighCVSS 7.1Exploitation Probability (EPSS)
Low risk9th percentile - higher than 9% of all known CVEs
Summary
A heap-buffer-overflow vulnerability exists in the nothings stb TrueType library, up to version 1.26, when parsing malformed TTF files. The issue is in the stbtt__GetGlyphShapeTT() function in stb_truetype.h, triggered when an application loads, bakes, or renders a malicious font.
Risk Assessment
An attacker can exploit this to read out-of-bounds memory, potentially leading to information disclosure or application crashes in software using this library (e.g., game engines, graphics tools).
Recommendation
Update the stb_truetype.h library to the latest patched version. If not possible, restrict trust in font files from untrusted sources.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS