I apologize for not being able to provide an SSCCE, as this segfault seems to happen in some multi-threaded context that is hard to reproduce for me at the moment.

Looking again at the stacktrace, I took a look at libcurl in this environment and realized that it is a pretty old version of libcurl (7.61) even though it is the standard libcurl for Oracle Linux 8 (supposedly still supported). I've attempted to rebuild and install libcurl from source to a newer version and use that instead.