https://github.com/net-snmp/net-snmp/blob/v5.9.4/CHANGES

*5.9.4*:

    IMPORTANT: SNMP over TLS and/or DTLS are not functioning properly
    in this release with various versions of OpenSSL and will be fixed
    in a future release.

    libsnmp:
      - Remove the SNMP_SWIPE_MEM() macro Remove this macro since it is not
        used in the Net-SNMP code base.
      - DISPLAY-HINT fixes
      - Miscellanious improvements to the transports
      - Handle multiple oldEngineID configuration lines
      - fixes for DNS names longer than 63 characters

    agent:
      - Added a ignoremount configuration option for the HOST-MIB
      - disallow SETs with a NULL varbind
      - fix the --enable-minimalist build

    apps:
      - snmpset: allow SET with NULL varbind for testing
      - snmptrapd: improved MySQL logging code

    general:
      - configure: Remove -Wno-deprecated as it is no longer needed
      - miscellanious ther bug fixes, build fixes and cleanups