incorrect freeing of a invalid pointer when bouncing a message to the originator or local postmaster causes DoS on fetchmail < 6.3.2, including all Fetchmail 6.3.2-Release Candidates. Resolution: upgrade to 6.3.2 - 6.2.x is End of Lifed. Advisory in URL.
the stable version is unaffected and the latest unstable version is fixed, too: nothing left to do for security here, reassigning this to net-mail, maybe you want to remove 6.3.0 and 6.3.1?
removed 6.3.0 and 6.3.1.