Security vulnerabilities and automated fixes for stb image issues
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A critical buffer overflow vulnerability was discovered in stb_image.h at line 4823, where a memcpy operation copied image data without validating buffer bounds. The multiplication of width (x) and channel count (img_n) could overflow or exceed allocated memory, allowing attackers to corrupt memory through malicious PNG files. The fix adds an explicit size_t cast to prevent integer overflow during the buffer size calculation.
A critical heap buffer overflow vulnerability was discovered and patched in a vendored copy of `stb_image.h`, a popular single-header image loading library. The root cause was a missing bounds check that allowed attacker-controlled image data to trigger memory writes beyond allocated heap buffers, potentially enabling arbitrary code execution. A single defensive guard — rejecting negative buffer lengths before any memory operation — closes this dangerous attack vector.