See http://sourceforge.net/project/shownotes.php?release_id=500765 and http://www.heise-security.co.uk/news/88283 for more details. The update to 0.90.2 will fix it.
Copy from bug #230075 comment #35: ---- 0.88.7-2 should not be vulnerable to the issues fixed by 0.90.2. CHM fd leak does not seem to triggerable by attackers (happens only when an 'fdopen()' fails, and there is a test whether open(2) returns !0 instead of <0). 0.90.x executes other code which might lead to the fd leak. CAB scanning was disabled by the fix for CVE-2007-0897, and 0.88.7 does not contain code for PDF scanning overall.
*** Bug 236948 has been marked as a duplicate of this bug. ***