Research in Motion has issued a security patch for the Blackberry, warning that it is vulnerable to attacks by hackers.

"Multiple security vulnerabilities exist in the PDF distiller of some released versions of the BlackBerry Attachment Service. These vulnerabilities could enable a malicious individual to send an email message containing a specially crafted PDF file, which when opened for viewing on a BlackBerry smartphone, could cause memory corruption and possibly lead to arbitrary code execution on the computer that hosts the BlackBerry Attachment Service."

RIM recommends that users do not open attachments until the patch is installed. You can read more about it at the link below.