Ubuntu Security Notices USN-8720-1 USN-8720-1: GnuPG vulnerability Publication date 3 September 2026 Overview GnuPG could allow encrypted messages to be forged under certain circumstances. Releases 26.04 LTS 24.04 LTS Open side navigation Close side navigation Packages Details Update instructions References Packages gnupg2 - GNU privacy guard - a free PGP replacement Details It was discovered that GnuPG incorrectly validated authentication tag lengths when parsing CMS messages encrypted with AES-GCM. An attacker could possibly use this issue to bypass message integrity checks. It was discovered that GnuPG incorrectly validated authentication tag lengths when parsing CMS messages encrypted with AES-GCM. An attacker could possibly use this issue to bypass message integrity checks. Update instructions In general, a standard system update will make all the necessary changes. Learn more about how to get the fixes. The problem can be corrected by updating your system to the following package versions: Ubuntu Release Package Version 26.04 LTS resolute gpgsm – 2.4.8-4ubuntu3.1 24.04 LTS noble gpgsm – 2.4.4-2ubuntu17.6 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 References CVE-2026-57062 CVE-2026-57062