So keep an eye out for Pidgin 2.11 landing in 15.04 or a PPA.For me it sounds bad that Pidgin is not updated in the repositories of older LTS versions if they release some security updates.

updating pidgin in ubuntu-67updating pidgin in ubuntu-66

The Ubuntu changelog displays the same security updates.

As Mc Duck pointed out, version updates are different from security patches.

Exactly same ones that were fixed in Pidgin 2.10.10.

(excluding CVE-2014-3697, as that's only relevant for Windows version) Similarly, Ubuntu 12.04 is running even older Pidgin version, 2.10.3-0ubuntu1.6, but the Ubuntu patches are up-to-date with latest Pidgin security patches.

, Bonjour, Gadu-Gadu, IRC, Novell Group Wise Messenger, Lotus Sametime, SILC, SIMPLE, MXit, and Zephyr. Pidgin supports many features of these chat networks, such as file transfers, away messages, buddy icons, custom smilies, and typing notifications.

Numerous plugins also extend Pidgin’s functionality above and beyond the standard features.

Install the latest Pidgin 2.11 via PPA in Ubuntu 16.04 Systems.

Pidgin is an easy to use and free chat client used by millions.

It's more likely that the security fixes would end being patched into the current version rather than updating to latest version.

In general Ubuntu's updates favour stability between tested versions over updates to latest versions, so if it's possible to apply security patches to the version already tested and approved for whatever Ubuntu release you are running, then that's what's going to happen.

The purpose of an LTS is to provide five-year group of software that has predictable behavior; that does not change, except for security and important bugfixes.