CVE-2023-5129 (libwebp)

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 …

account array buffer cve cve-2023-5129 data file function libwebp may size value webp