Multiple buffer overflows in sharutils 4.2.1 and earlier may allow attackers to execute arbitrary code via (1) long output from wc to shar, or (2) unknown vectors in unshar.

uudecode, as available in the sharutils package before 4.2.1, does not check whether the filename of the uudecoded file is a pipe or symbolic link, which could allow attackers to overwrite files or execute commands.

Stack-based buffer overflow in shar in GNU sharutils 4.2.1 allows local users to execute arbitrary code via a long -o command line argument.