util.c in libpurple in Pidgin before 2.10.8 does not properly allocate memory for HTTP responses that are inconsistent with the Content-Length header, which allows remote HTTP servers to cause a denial of service (application crash) via a crafted response.
https://rhn.redhat.com/errata/RHSA-2014-0139.html
http://www.ubuntu.com/usn/USN-2100-1
http://www.debian.org/security/2014/dsa-2859
http://pidgin.im/news/security/?id=73
http://lists.opensuse.org/opensuse-updates/2014-03/msg00005.html
http://lists.opensuse.org/opensuse-updates/2014-02/msg00039.html