FreeBSD Security Advisory - The bzip2/bunzip2 utilities and the libbz2 library compress and decompress files using an algorithm based on the Burrows-Wheeler transform. They are generally slower than Lempel-Ziv compressors such as gzip, but usually provide a greater compression ratio. When decompressing data, the run-length encoded values are not adequately sanity-checked, allowing for an integer overflow.
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