An information leak exists in the handling of the MXIT protocol in Pidgin. Specially crafted MXIT data sent via the server could potentially result in an out of bounds read. A malicious user, server, or man-in-the-middle can send an invalid size for an avatar which will trigger an out-of-bounds read vulnerability. This could result in a denial of service or copy data from memory to the file, resulting in an information leak if the avatar is sent to another user. External references: http://www.talosintel.com/reports/TALOS-2016-0135/ http://www.pidgin.im/news/security/?id=100 Upstream fixes: https://bitbucket.org/pidgin/main/commits/5e3601f8bde4 https://bitbucket.org/pidgin/main/commits/1c5197a66760 https://bitbucket.org/pidgin/main/commits/648f667a679c