There are inofficial packages for 5.0.0 available:

    http://dmaphy.fedorapeople.org/zsh/

I will make an official update if I get around to it and no one beats me to do it. :)

zsh-5.0.0-1.fc18 has been submitted as an update for Fedora 18.
https://admin.fedoraproject.org/updates/zsh-5.0.0-1.fc18

zsh-5.0.0-1.fc17 has been submitted as an update for Fedora 17.
https://admin.fedoraproject.org/updates/zsh-5.0.0-1.fc17

Package zsh-5.0.0-1.fc18:
* should fix your issue,
* was pushed to the Fedora 18 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing zsh-5.0.0-1.fc18'
as soon as you are able to.
Please go to the following url:
https://admin.fedoraproject.org/updates/FEDORA-2012-18818/zsh-5.0.0-1.fc18
then log in and leave karma (feedback).

zsh-5.0.0-1.fc18 has been pushed to the Fedora 18 stable repository.  If problems still persist, please make note of it in this bug report.

zsh-5.0.0-1.fc17 has been pushed to the Fedora 17 stable repository.  If problems still persist, please make note of it in this bug report.