The virBitmapParse function was calling virBitmapIsSet() function that requires the caller to check the bounds of the bitmap without checking them. This resulted into crashes when parsing a bitmap string that was exceeding the bounds used as argument.
This issue did not affect the versions of libvirt package as shipped with Red Hat Enterprise Linux 5 and 6.
Created libvirt tracking bugs for this issue:
Affects: fedora-all [bug 1006511]
libvirt-18.104.22.168-2.fc19 has been pushed to the Fedora 19 stable repository. If problems still persist, please make note of it in this bug report.