SeaMonkey is an open source web browser, email and newsgroup client, IRC chat client, and HTML editor. An invalid free flaw was found in SeaMonkey"s plugin handler. Malicious web content could result in an invalid memory pointer being freed, causing SeaMonkey to crash or, potentially, execute arbitrary code with the privileges of the user running SeaMonkey. All SeaMonkey users should upgrade to these updated packages, which correct this issue. After installing the update, SeaMonkey must be restarted for the changes to take effect.