This article describes a malformed archive file bypass vulnerability within the Sophos products that use the Sophos Anti-Virus detection engine. There are no known-in-the-wild exploits of this vulnerability at the time of publication. Applies to: Sophos Anti-Virus for Windows 2000+ (version 7.6.7 and below) Sophos Anti-Virus for Windows NT/95/98 (version 4.7.22 and below) Sophos Anti-Virus for OS X (version 4.9.22/7.01 and below) Sophos Anti-Virus for UNIX (version 7.0.9 and below) Sophos Anti-Virus for Linux (version 6.6.2 and below) Sophos Anti-Virus for UNIX and Netware (version 4.41.9 and below) Sophos Email Appliance (version 3.1.3.1 and below) Sophos Web Appliance (version 2.1.18 and below) PureMessage for UNIX (version 5.5.4 and below)