========================================================================== Ubuntu Security Notice USN-8521-1 July 09, 2026
libidn vulnerability ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 26.04 LTS - Ubuntu 24.04 LTS - Ubuntu 22.04 LTS Summary: Libidn could be made to crash or expose sensitive information if it received specially crafted input. Software Description: - libidn: implementation of IETF IDN specifications Details: It was discovered that Libidn incorrectly handled certain internationalized domain name strings. An attacker could possibly use this issue to obtain sensitive information or cause a denial of service. Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 26.04 LTS libidn12 1.43-2ubuntu0.26.04.1 Ubuntu 24.04 LTS libidn12 1.42-1ubuntu0.1 Ubuntu 22.04 LTS libidn12 1.38-4ubuntu1.1 In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-8521-1 CVE-2026-57053 Package Information: https://launchpad.net/ubuntu/+source/libidn/1.43-2ubuntu0.26.04.1 https://launchpad.net/ubuntu/+source/libidn/1.42-1ubuntu0.1 https://launchpad.net/ubuntu/+source/libidn/1.38-4ubuntu1.1
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