CVE-2011-3872: Puppet

Low severity, CVSS 2.6. EPSS: 2.5% chance of exploitation in the next 30 days.

Puppet 2.6.x before 2.6.12 and 2.7.x before 2.7.6, and Puppet Enterprise (PE) Users 1.0, 1.1, and 1.2 before 1.2.4, when signing an agent certificate, adds the Puppet master's certdnsnames values to the X.509 Subject Alternative Name field of the certificate, which allows remote attackers to spoof a Puppet master via a man-in-the-middle (MITM) attack against an agent that uses an alternate DNS name for the master, aka "AltNames Vulnerability."

Affected products

• Puppet Puppet: version 2.6.0 only; version 2.6.1 only; version 2.6.2 only; version 2.6.3 only; version 2.6.4 only; version 2.6.5 only; …
• Puppet Puppet Enterprise: version 1.2.0 only; version 1.2.1 only; version 1.2.2 only; version 1.2.3 only
• Puppetlabs Puppet: version 2.7.0 only; version 2.7.1 only
• Puppetlabs Puppet Enterprise Users: version 1.0 only; version 1.1 only

Published 2011-10-27. Last modified 2026-06-16.