postgresql-server -- Memory disclosure in aggregate function calls

PostgreSQL Project reports:

    Certain aggregate function calls receiving "unknown"-type
    arguments could disclose bytes of server memory from the end of
    the "unknown"-type value to the next zero byte. One typically
    gets an "unknown"-type value via a string literal having no type
    designation. We have not confirmed or ruled out viability of
    attacks that arrange for presence of notable, confidential
    information in disclosed bytes.