Ubuntu Security Notices USN-8320-1 USN-8320-1: Memcached vulnerabilities Publication date 27 May 2026 Overview Memcached could be made to expose sensitive information over the network. Releases 26.04 LTS 25.10 24.04 LTS 22.04 LTS Open side navigation Close side navigation Packages Details Update instructions References Packages memcached - High-performance in-memory object caching system Details It was discovered that Memcached's SASL password database authentication had a timing side channel when handling username and password data. A remote attacker could possibly use this issue to obtain sensitive information. It was discovered that Memcached's SASL password database authentication had a timing side channel when handling username and password data. A remote attacker could possibly use this issue to obtain sensitive information. 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 memcached – 1.6.40-1ubuntu0.1 25.10 questing memcached – 1.6.38-1ubuntu0.1 24.04 LTS noble memcached – 1.6.24-1ubuntu0.1 22.04 LTS jammy memcached – 1.6.14-1ubuntu0.2 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-2026-47784 CVE-2026-47783 CVE-2026-47784 CVE-2026-47783