Perl 5.10.x allows context-dependent attackers to cause a denial of service (NULL pointer dereference and application crash) by leveraging an ability to inject arguments into a (1) getpeername, (2) readdir, (3) closedir, (4) getsockname, (5) rewinddir, (6) tell, or (7) telldir function call.
https://exchange.xforce.ibmcloud.com/vulnerabilities/67355
http://www.securityfocus.com/archive/1/517916/100/0/threaded