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[USN-8320-1] Memcached vulnerabilities

Posted on 27 May 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8320-1
May 27, 2026

memcached vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

Memcached could be made to expose sensitive information over the network.

Software Description:
- 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.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 26.04 LTS
memcached 1.6.40-1ubuntu0.1

Ubuntu 25.10
memcached 1.6.38-1ubuntu0.1

Ubuntu 24.04 LTS
memcached 1.6.24-1ubuntu0.1

Ubuntu 22.04 LTS
memcached 1.6.14-1ubuntu0.2

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-8320-1
CVE-2026-47783, CVE-2026-47784

Package Information:
https://launchpad.net/ubuntu/+source/memcached/1.6.40-1ubuntu0.1
https://launchpad.net/ubuntu/+source/memcached/1.6.38-1ubuntu0.1
https://launchpad.net/ubuntu/+source/memcached/1.6.24-1ubuntu0.1
https://launchpad.net/ubuntu/+source/memcached/1.6.14-1ubuntu0.2

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