You're asking in the wrong location. This mailing list is used for conversations about the creation and maintenance of the Jenkins documentation. You want the Jenkins users mailing list or the Jenkins gitter channels. Refer to
https://www.jenkins.io/chat/ for chat channels and to
https://www.jenkins.io/mailing-lists/ for mailing lists.
I'm not aware of any immediately available way of interrupting a Jenkins job if the GitHub repository has flagged security issues. It seems that interrupting the job would be the worst of all possible solutions, since that would prevent any automated evaluation of fixes to the vulnerabilities. You may want to check with the people that provided the requirement to see if they want to further refine the requirement.
A further refinement might be "check the GitHub repository for GitHub reported security issues, cancel the job if running on the master branch". In that case, you might place an initial "check GitHub security reports" as the first stage of your Jenkins Pipeline. That check would need to call a GitHub API to check that report. If the return value was not what was expected, then fail the build immediately.
That technique cancels the build when a condition is detected rather than interrupting it. That technique might allow pull requests fixing security issues to still be evaluated by Jenkins, without allowing builds on the master branch.
Mark Waite