cipher.c in the Cipher API in libpurple in Pidgin before 2.7.10 retains encryption-key data in process memory, which might allow local users to obtain sensitive information by reading a core file or other representation of memory contents.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A18223
https://euvd.enisa.europa.eu/vulnerability/EUVD-2011-4833
http://www.pidgin.im/news/security/?id=50