This update for python3 provides the following fixes: These security issues were fixed: - CVE-2018-1061: Prevent catastrophic backtracking in the difflib.IS_LINE_JUNK method. An attacker could have used this flaw to cause denial of service . - CVE-2018-1060: Prevent catastrophic backtracking in pop3lib"s apop method. An attacker could have used this flaw to cause denial of service . These non-security issues were fixed: - Sort files and directories when creating tarfile archives so that they are created in a more predictable way. - Add -fwrapv to OPTS