Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process. The following link provides references to all essential vulnerability management information. If something is wrong or missing, please contact a member of PSIRT. https://spaces.redhat.com/display/PRODSEC/Vulnerability+Management+-+Essential+Documents+for+Engineering+Teams
the zlib fork that's part of zsync does not ship the untgz binary, nor any of its source files. there is no reference to TGZfname in the source at all. so this cve is not applicable.