A specially crafted DNS query may cause Unbound to stop responding. Unbound is a free validating, recursive and caching DNS resolver developed and maintained by NLnet Labs. Unbound runs on Linux boxes and the vulnerability can allow a remote user to cause the daemon to crash creating a denial of service condition. Versions 1.0 to 1.4.9 are affected and users are advised to update their version to 1.4.10 to fix this issue.
For more information about this vulnerability and to download the latest version go here.