Out-of-bounds Write vulnerability in Apache Commons Configuration.This issue affects Apache Commons Configuration: from 2.0 before 2.10.1. Users are recommended to upgrade to version 2.10.1, which fixes the issue.
https://www.securityweek.com/atlassian-patches-vulnerabilities-in-bitbucket-confluence-jira/
https://lists.apache.org/thread/03nzzzjn4oknyw5y0871tw7ltj0t3r37