CentOS yum *.rpm package changelog (not installation changelog)
Solution 1:
The canonical tool for managing RPM packages is rpm.
To query the Changelog of an RPM package the command would be:
rpm -q --changelog openssl
Solution 2:
You can also check the changelog of unistalled packages with the repoquery command which is part of yum-utils package.
repoquery -q --changelog httpd | less