Pierre Noguès discovered that Pidgin incorrectly handled malformed SLP messages in the MSN protocol handler. A remote attacker could send a specially crafted message and cause Pidgin to crash, leading to a denial of service. This issue only affected Ubuntu 8.04 LTS, 9.10 and 10.04 LTS. Daniel Atallah discovered that Pidgin incorrectly handled the return code of the Base64 decoding function. A remote attacker could send a specially crafted message and cause Pidgin to crash, leading to a denial of service