This regression update follows up on an upstream regression update  regarding CVE-2019-3859.
With the previous libssh2 package revision, it was observed that user authentication with private/public key pairs would fail under certain circumstances.
For Debian 7 Wheezy, these problems have been fixed in version 1.4.2-1.1+deb7u4.
We recommend that you upgrade your libssh2 packages.
Further information about Extended LTS security advisories can be found at: https://deb.freexian.com/extended-lts/