c3p0 0.9.5.2 allows XXE in extractXmlConfigFromInputStream in com/mchange/v2/c3p0/cfg/C3P0ConfigXmlUtils.java during initialization.
https://lists.debian.org/debian-lts-announce/2018/12/msg00021.html
https://github.com/zhutougg/c3p0/commit/2eb0ea97f745740b18dd45e4a909112d4685f87b