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At least a 1024 bit prime should be used as the default.  Generating a file with the parameters at installation time might not be feasible, but it would prevent any appearance of choosing a special prime that makes the discrete logarithm problem feasible.

Upstream fix:

commit 281d1bd6515c2f0f8984fc168fb3d3b91c20bdc0
Author: Gerhard Rieger <gerhard>
Date:   Sun Jan 4 16:38:36 2015 +0100

    FIPS requires 1024 bit DH prime

(In reply to Florian Weimer from comment #4)
> Upstream fix:
> 
> commit 281d1bd6515c2f0f8984fc168fb3d3b91c20bdc0
> Author: Gerhard Rieger <gerhard>
> Date:   Sun Jan 4 16:38:36 2015 +0100
> 
>     FIPS requires 1024 bit DH prime

This upstream fix:

http://repo.or.cz/socat.git/commitdiff/281d1bd6515c2f0f8984fc168fb3d3b91c20bdc0

was found to be problematic - see CVE-2016-2217 / bug 1305437, and replaced with:

http://repo.or.cz/socat.git/commitdiff/eab3c89f2dc0df0d9638941891e8ab233dfb0611

this fix is in 1.7.3.1 as well

Any update, why don't we upgrade socat?

+1 for this, socat has also issues when used in MariaDB Galera cluster with SSL/TLS SST - https://jira.mariadb.org/browse/MDEV-9403
Please, rebase socat to latest stable 1.7.3.1 version.

I needed it for additional fun with MariaDB, so I've rebuilt the package with COPR: https://copr.fedorainfracloud.org/coprs/mstefany/socat/

This bug is addressed by ERRATA RHBA-2017:2049-03 socat bug fix update

https://errata.devel.redhat.com/advisory/26967