Here you can find information related to the security and privacy of GitHub links for Jira application.
End User License Agreement
Security Bug Bounty
Github Links for Jira is enrolled on the Bug Bounty program. More information can be found here https://www.atlassian.com/licensing/marketplace#general-faqs
Security Self Assessment Questionaire
Github Links for Jira is part of the Move Work Forward Atlassian Marketplace Partner app portfolio. Move Work Forward provides all required answers to Atlassian annually.
More details can be found here https://developer.atlassian.com/platform/marketplace/security-self-assessment-program/