This update for pidgin to version 2.12.0 fixes the following issues:

This security issue was fixed:
- CVE-2017-2640: Out of bounds memory read in purple_markup_unescape_entity (boo#1028835).

These non-security issues were fixed:
+ libpurple:
- Fix the use of uninitialised memory if running
non-debug-enabled versions of glib.
- Update AIM dev and dist ID's to new ones that were assigned
by AOL.
- TLS certificate verification now uses SHA-256 checksums.
- Fix the SASL external auth for Freenode (boo#1009974).
- Remove the MSN protocol plugin. It has been unusable and
dormant for some time.
- Remove the Mxit protocol plugin. The service was closed at
the end ofSeptember 2016.
- Remove the MySpaceIM protocol plugin. The service has been
defunct for a long time (pidgin.im#15356).
- Remove the Yahoo! protocol plugin. Yahoo has completely
reimplemented their protocol, so this version is no longer
operable as of August 5th, 2016.
- Remove the Facebook (XMPP) account option. According to
https://developers.facebook.com/docs/chat the XMPP Chat API
service ended April 30th, 2015.
- Fix gnutls certificate validation errors that mainly
affected Google.
+ General:
- Replace instances of d.pidgin.im with developer.pidgin.im and
update the urls to use https (pidgin.im#17036).
+ IRC:
- Fix an issue of messages being silently cut off at 500
characters. Large messages are now split into parts and sent
one by one (pidgin.im#4753).