An issue was discovered in uriparser before 0.9.0. UriCommon.c allows attempted operations on NULL input via a uriResetUri* function.
https://lists.debian.org/debian-lts-announce/2018/11/msg00019.html
https://github.com/uriparser/uriparser/commit/f58c25069cf4a986fe17a80c5b38687e31feb539
https://github.com/uriparser/uriparser/blob/uriparser-0.9.0/ChangeLog