Mongocxx fails to connect to mongoDB with SSL

I completed the following tutorial (https://medium.com/@rajanmaharjan/secure-your-mongodb-connections-ssl-tls-92e2addb3c89) to set up self-signed SSL certificates to secure communications between a device and a server hosting a mongoDB database.

I can access the database from the server and from the device with the following command:

mongo --ssl --sslCAFile /path/to/CA.pem --sslPEMKeyFile /path/to/mongodb.pem --host IP:port

Error

When I try to connect to the database with a C++ program, I get a seg fault:

Segmentation fault (core dumped)

Output from GDB is

Program received signal SIGSEGV, Segmentation fault. 0x0000007fb7f6d6a8 in mongocxx::v_noabi::client::client(mongocxx::v_noabi::uri const&, mongocxx::v_noabi::options::client const&) () from /usr/local/lib/libmongocxx.so._noabi

C++ code

I instanciate the connection with:

mongocxx::instance instance{};

mongocxx::options::ssl ssl_opts;
ssl_opts.pem_file("/path/to/mongodb.pem");
// ssl_opts.allow_invalid_certificates(false); // I have tried this

mongocxx::options::client client_opts;
client_opts.ssl_opts(ssl_opts);

auto client = mongocxx::client{mongocxx::uri{"mongodb://user:pwd@IP:port/?authMechanism=MONGODB-X509&ssl=true"}, client_opts};

And compile with the following command:

c++ --std=c++11 main.cpp $(pkg-config --cflags --libs libmongocxx) -Wl,-rpath,/usr/local/lib

I have not been able to fix this error or find a solution online, any help would be much appreciated.

Additional Information

Versions:

Mongo c - 1.10.1

Mongo cxx - 3.3.0

Backtrace:

(gdb) thread apply all bt

Thread 1 (Thread 0x7fb7ff4000 (LWP 17800)):
#0  0x0000007fb7f6d6a8 in 
mongocxx::v_noabi::client::client(mongocxx::v_noabi::uri const&, 
mongocxx::v_noabi::options::client const&) () from 
/usr/local/lib/libmongocxx.so._noabi
#1  0x00000000004027d0 in main ()

Solution

There's a known serious bug with passing options::ssl_opts to the client constructor in the C++ driver version 3.3.0 causing the segfault. This is fixed in 3.3.1. It is highly recommended that you upgrade.

As a workaround for 3.3.0, you can pass the pem_file option through the URI string. The URI option "sslclientcertificatekeyfile" corresponds to the options::ssl::pem_file option. E.g:

auto uri = mongocxx::uri{"mongodb://localhost/?ssl=true&sslclientcertificatekeyfile=/path/to/mongodb.pem"};

But do upgrade to 3.3.1 if possible.