In nDPI through 3.2, the H.323 dissector is vulnerable to a heap-based buffer over-read in ndpi_search_h323 in lib/protocols/h323.c, as demonstrated by a payload packet length that is too short.
https://lists.debian.org/debian-lts-announce/2022/08/msg00016.html
https://github.com/ntop/nDPI/commit/b7e666e465f138ae48ab81976726e67deed12701