A remote overflow exists in WinRAR. The 'UNACEV2.DLL' library fails to perform proper bounds checking resulting in a buffer overflow. With a specially crafted ACE archive containing a compressed file with an overly long filename, a remote attacker can cause arbitrary code execution resulting in a loss of integrity.
Upgrade to version 3.51 or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.