CVE-2021-22898

curl 7.7 through 7.76.1 suffers from an information disclosure when the
-t command line option, known as CURLOPT_TELNETOPTIONS in libcurl, is
used to send variable=content pairs to TELNET servers. Due to a flaw in the
option parser for sending NEW_ENV variables, libcurl could be made to pass
on uninitialized data from a stack based buffer to the server, resulting in
potentially revealing sensitive internal information to the server using a
clear-text network protocol.