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USN-5732-1: Unbound vulnerability

17 November 2022

Unbound could be made to stop responding if it received specially crafted network traffic.



  • unbound - validating, recursive, caching DNS resolver


It was discovered that Unbound incorrectly handled delegations with a large
number of non-responsive nameservers. A remote attacker could possibly use
this issue to cause Unbound to consume resources, leading to a denial of

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 22.10
Ubuntu 22.04
Ubuntu 20.04
Ubuntu 18.04

In general, a standard system update will make all the necessary changes.