========================================================================== Ubuntu Security Notice USN-8549-1 July 15, 2026
python-idna 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: idna could be made to consume resources if it received specially crafted input. Software Description: - python-idna: Python IDNA2008 (RFC 5891) handling Details: It was discovered that idna did not properly reject oversized inputs before performing expensive processing. An attacker could possibly use this issue to cause idna to consume significant resources, leading to a denial of service. Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 26.04 LTS python3-idna 3.11-1ubuntu0.1 Ubuntu 24.04 LTS python3-idna 3.6-2ubuntu0.2 Ubuntu 22.04 LTS python3-idna 3.3-1ubuntu0.2 In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-8549-1 CVE-2026-45409 Package Information: https://launchpad.net/ubuntu/+source/python-idna/3.11-1ubuntu0.1 https://launchpad.net/ubuntu/+source/python-idna/3.6-2ubuntu0.2 https://launchpad.net/ubuntu/+source/python-idna/3.3-1ubuntu0.2
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