Redis is an open source, in-memory database that persists on disk. An
integer overflow bug affecting all versions of Redis can be exploited to
corrupt the heap and potentially be used to leak arbitrary contents of the
heap or trigger remote code execution. The vulnerability involves changing
the default set-max-intset-entries configuration parameter to a very large
value and constructing specially crafted commands to manipulate sets. The
problem is fixed in Redis versions 6.2.6, 6.0.16 and 5.0.14. An additional
workaround to mitigate the problem without patching the redis-server
executable is to prevent users from modifying the set-max-intset-entries
configuration parameter. This can be done using ACL to restrict
unprivileged users from using the CONFIG SET command.