namei in FreeBSD 9.1 through 10.1-RC2 allows remote attackers to cause a denial of service (memory exhaustion) via vectors that trigger a sandboxed process to look up a large number of nonexistent path names.
https://www.freebsd.org/security/advisories/FreeBSD-SA-14:22.namei.asc
http://www.securitytracker.com/id/1031100