An issue was discovered in uriparser before 0.9.0. UriQuery.c allows an out-of-bounds write via a uriComposeQuery* or uriComposeQueryEx* function because the '&' character is mishandled in certain contexts.
https://lists.debian.org/debian-lts-announce/2018/11/msg00019.html
https://github.com/uriparser/uriparser/commit/864f5d4c127def386dd5cc926ad96934b297f04e
https://github.com/uriparser/uriparser/blob/uriparser-0.9.0/ChangeLog