--- title: 'USN-6791-1: Unbound vulnerability | Ubuntu security notices' description: Ubuntu is an open source software operating system that runs from the desktop, to the cloud, to all your internet connected things. url: https://ubuntu.com/security/notices/USN-6791-1 --- 1. [Ubuntu Security Notices](https://ubuntu.com/security/notices) 2. USN-6791-1 --- # USN-6791-1: Unbound vulnerability Publication date 28 May 2024 Overview Unbound could be made to take part in a denial of service attack. Releases [24.04 LTS](https://ubuntu.com/security/notices?release=noble) [23.10](https://ubuntu.com/security/notices?release=mantic) [22.04 LTS](https://ubuntu.com/security/notices?release=jammy) [20.04 LTS](https://ubuntu.com/security/notices?release=focal) --- Open side navigation ## Packages * [unbound](https://ubuntu.com/security/cves?package=unbound) - validating, recursive, caching DNS resolver ## Details It was discovered that Unbound could take part in a denial of service amplification attack known as DNSBomb. This update introduces certain resource limits to make the impact from Unbound significantly lower. ## Update instructions In general, a standard system update will make all the necessary changes. [Learn more about how to get the fixes.](https://ubuntu.com/security/cves/about#security) The problem can be corrected by updating your system to the following package versions: | Ubuntu Release | Package Version | | --- | --- | | 24.04 LTS noble | [libunbound8](https://launchpad.net/ubuntu/+source/unbound) –  [1.19.2-1ubuntu3.1](https://launchpad.net/ubuntu/+source/unbound/1.19.2-1ubuntu3.1) | | | | [unbound](https://launchpad.net/ubuntu/+source/unbound) –  [1.19.2-1ubuntu3.1](https://launchpad.net/ubuntu/+source/unbound/1.19.2-1ubuntu3.1) | | | | 23.10 mantic | [libunbound8](https://launchpad.net/ubuntu/+source/unbound) –  [1.17.1-2ubuntu0.2](https://launchpad.net/ubuntu/+source/unbound/1.17.1-2ubuntu0.2) | | | | [unbound](https://launchpad.net/ubuntu/+source/unbound) –  [1.17.1-2ubuntu0.2](https://launchpad.net/ubuntu/+source/unbound/1.17.1-2ubuntu0.2) | | | | 22.04 LTS jammy | [libunbound8](https://launchpad.net/ubuntu/+source/unbound) –  [1.13.1-1ubuntu5.5](https://launchpad.net/ubuntu/+source/unbound/1.13.1-1ubuntu5.5) | | | | [unbound](https://launchpad.net/ubuntu/+source/unbound) –  [1.13.1-1ubuntu5.5](https://launchpad.net/ubuntu/+source/unbound/1.13.1-1ubuntu5.5) | | | | 20.04 LTS focal | [libunbound8](https://launchpad.net/ubuntu/+source/unbound) –  [1.9.4-2ubuntu1.6](https://launchpad.net/ubuntu/+source/unbound/1.9.4-2ubuntu1.6) | | | | [unbound](https://launchpad.net/ubuntu/+source/unbound) –  [1.9.4-2ubuntu1.6](https://launchpad.net/ubuntu/+source/unbound/1.9.4-2ubuntu1.6) | | | --- ### Reduce your security exposure Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines. [Get Ubuntu Pro](https://ubuntu.com/pro) ## References * [CVE-2024-33655](https://ubuntu.com/security/CVE-2024-33655)