Changelog for json-c12-0.12.1-4.el7.x86_64.rpm :

* Sat May 16 2020 Björn Esser - 0.12.1-4- Drop the unneeded %pretrans scriptlet
* Fri May 15 2020 Björn Esser - 0.12.1-3- Fix CVE-2020-12762
* Sat Dec 16 2017 Björn Esser - 0.12.1-2- Add patch to fix undefined behaviour by assert
* Mon May 08 2017 Jeffrey Lau - 0.12.1-1- Initial compat-package for EPEL >= 6, based on json-c from recent Fedora