An issue was discovered in InspIRCd 2 before 2.0.29 and 3 before 3.6.0. The pgsql module contains a use after free vulnerability. When combined with the sqlauth or sqloper modules, this vulnerability can be used for remote crashing of an InspIRCd server by any user able to connect to a server.
Debian Linux Security Advisory 4764-1 - Two security issues were discovered in the pgsql and mysql modules of the InspIRCd IRC daemon, which could result in denial of service.