A flaw was found in FreeType. In affected versions, an out-of-bounds write condition may be triggered when attempting to parse font subglyph structures related to TrueType GX and variable font files. The vulnerable code assigns a signed short value to an unsigned long and then adds a static value, causing it to wrap around and allocate a heap buffer that is too small. The code then writes up to 6 signed long integers out of bounds relative to this buffer. This issue could result in arbitrary code execution or other undefined behavior.
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