Fedora has released security update for spamassassin to fix the vulnerability.
This vulnerability could be exploited to gain complete access to sensitive information. Malicious users could also use this vulnerability to change all the contents or configuration on the system.
Fedora has issued updated packages to fix this vulnerability.
For more information about the vulnerability and obtaining patches, refer to the following Fedora security advisories:
Fedora 27 Update
Following are links for downloading patches to fix the vulnerabilities: