Version 1.3.2 has these key updates from 1.3.1:

• Address findings of the 7ASecurity audit of zlib.
• Check for negative lengths in crc32_combine functions.
• Copy only the initialized window contents in inflateCopy.
• Prevent the use of insecure functions without an explicit request.
• Add compressBound_z and deflateBound_z functions for large values.
• Use atomics to build inflate fixed tables once.
• Add --undefined option to ./configure for UBSan checker.
• Copy only the initialized deflate state in deflateCopy.
• Zero inflate state on allocation.
• Add compress_z and uncompress_z functions.
• Complete rewrite of cmake support.
• Remove untgz from contrib.
• Vectorize the CRC-32 calculation on the s390x.
• Remove vstudio projects in lieu of cmake-generated projects.
• Add zipAlreadyThere() to minizip zip.c to help avoid duplicates.
• Add deflateUsed() function to get the used bits in the last byte.
• Fix bug in inflatePrime() for 16-bit ints.
• Add a "G" option to force gzip, disabling transparency in gzread().
• Return all available uncompressed data on error in gzread.c.
• Support non-blocking devices in the gz* routines.