It was reported  that a heap overflow flaw in nginx's custom DNS resolver was corrected in upstream version 1.0.10 ,. This resolver is most commonly used with the proxy and fastcgi modules, which are not enabled by default. As well, a malicious user would need to be in control of an upstream resolver host, or be able to brute-force the weakly-generated 16-bit transaction identifier, to exploit the flaw.
Created nginx tracking bugs for this issue
Affects: fedora-all [bug 754758]
Affects: epel-all [bug 754759]
nginx-1.0.10-1.fc16 has been pushed to the Fedora 16 stable repository. If problems still persist, please make note of it in this bug report.
nginx-1.0.10-1.fc15 has been pushed to the Fedora 15 stable repository. If problems still persist, please make note of it in this bug report.