========================================================================== Ubuntu Security Notice USN-7666-1 July 22, 2025
unbound vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 25.04 - Ubuntu 24.04 LTS - Ubuntu 22.04 LTS Summary: The Unbound cache could be poisoned if it received specially crafted network traffic. Software Description: - unbound: validating, recursive, caching DNS resolver Details: Xiang Li discovered that Unbound incorrectly handled EDNS Client Subnet (ECS) in certain configurations. A remote attacker could possibly use this issue to perform a cache poisoning attack called Rebirthday Attack. Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 25.04 libunbound8 1.22.0-1ubuntu1.1 unbound 1.22.0-1ubuntu1.1 Ubuntu 24.04 LTS libunbound8 1.19.2-1ubuntu3.5 unbound 1.19.2-1ubuntu3.5 Ubuntu 22.04 LTS libunbound8 1.13.1-1ubuntu5.11 unbound 1.13.1-1ubuntu5.11 In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-7666-1 CVE-2025-5994 Package Information: https://launchpad.net/ubuntu/+source/unbound/1.22.0-1ubuntu1.1 https://launchpad.net/ubuntu/+source/unbound/1.19.2-1ubuntu3.5 https://launchpad.net/ubuntu/+source/unbound/1.13.1-1ubuntu5.11
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