Heap buffer overflow in WebP in Google Chrome before 116.0.5845.187 allowed a remote malicious user to perform an out of bounds memory write via a crafted HTML page. (Chromium security severity: Critical) (CVE-2023-4863) With a specially crafted WebP lossless file, libwebp may write data out of bounds to the heap. The ReadHuffmanCodes() function allocates the HuffmanCode buffer with a size that comes from an array of precomputed sizes: kTableSize. The color_cache_bits value defines which size to use. The kTableSize array only takes into account sizes for 8-bit first-level table lookups but not second-level table lookups. libwebp allows codes that are up to 15-bit (MAX_ALLOWED_CODE_LENGTH). When BuildHuffmanTable() attempts to fill the second-level tables it may write data out-of-bounds. The OOB write to the undersized array happens in ReplicateValue. (CVE-2023-5129)
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