postgresql-server -- Buffer overrun from integer overflow in array modification

PostgreSQL Project reports:

    While modifying certain SQL array values, missing
    overflow checks let authenticated database users write
    arbitrary bytes to a memory area that facilitates
    arbitrary code execution. Missing overflow checks also
    let authenticated database users read a wide area of
    server memory. The CVE-2021-32027 fix covered some
    attacks of this description, but it missed others.