Comment # 10 on bug 1061208 from Richard Weinberger

(In reply to Marcus Meissner from comment #9)
> i think seperate versions of openssl are mixed together.
> 
> rpm -qif /lib64/libcrypto.so.1.0.0
> rpm -qif /usr/lib64/libssl.so.1.1
> rpm -qif /usr/lib64/libcrypto.so.1.1
> 
> (There should only be 1 libcrypto.so.1 loaded, so there are two installed
> ... one is from Leap, the other one is from somewhere else)

You are right, one version came from
repositories/security:/tls/openSUSE_Leap_42.3/.
This repo is present in my zypper config since I needed a package from there.
dup --from security_tls fixed the issue.

Feel free to close as invalid. ;-\