Same problem on Ubuntu 18.04 host :

stunnel4 -v
[ ] Clients allowed=500
[.] stunnel 5.44 on x86_64-pc-linux-gnu platform
[.] Compiled with OpenSSL 1.1.0g  2 Nov 2017
[.] Running  with OpenSSL 1.1.1  11 Sep 2018
[.] Update OpenSSL shared libraries or rebuild stunnel
[.] Threading:PTHREAD Sockets:POLL,IPv6,SYSTEMD TLS:ENGINE,FIPS,OCSP,PSK,SNI 
Auth:LIBWRAP
[ ] errno: (*__errno_location ())
[!] Invalid configuration file name "-v"
[!] realpath: No such file or directory (2)


In the log file :

INTERNAL ERROR: Bad magic at ssl.c, line 117

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https://bugs.launchpad.net/bugs/1847275

Title:
  stunnel4: "INTERNAL ERROR: Bad magic at ssl.c, line 117" - DoS
  vulnerability

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