There is a denial of service vulnerability in libmspack. The libmspack code is built into cabextract, so it is also vulnerable.
Secunia reports:
The vulnerability is caused due to an error when copying data from an uncompressed block (block type 0) and can be exploited to trigger an infinite loop by tricking an application using the library into processing specially crafted MS-ZIP archives.
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If you have found a vulnerability in a FreeBSD port not listed in the database, please contact the FreeBSD Security Team. Refer to "FreeBSD Security Information" for more information.