Pidgin is an instant messaging program which can log in to multiple accounts on multiple instant messaging networks simultaneously. A stack-based buffer overflow flaw was found in the Pidgin MXit protocol plug-in. A malicious server or a remote attacker could use this flaw to crash Pidgin by sending a specially-crafted HTTP request. A buffer overflow flaw was found in the Pidgin Sametime protocol plug-in. A malicious server or a remote attacker could use this flaw to crash Pidgin by sending a specially-crafted username. A buffer overflow flaw was found in the way Pidgin processed certain UPnP responses. A remote attacker could send a specially-crafted UPnP response that, when processed, would crash Pidgin. Red Hat would like to thank the Pidgin project for reporting the above issues. Upstream acknowledges Daniel Atallah as the original reporter of CVE-2013-0272. All Pidgin users should upgrade to these updated packages, which contain backported patches to resolve these issues. Pidgin must be restarted for this update to take effect.