Integer signedness error in (1) QuickLook in Apple Mac OS X 10.5.5 and (2) Office Viewer in Apple iPhone OS 1.0 through 2.1 and iPhone OS for iPod touch 1.1 through 2.1 allows remote attackers to cause a denial of service (application termination) and execute arbitrary code via a crafted Microsoft Excel file that triggers an out-of-bounds memory access, related to "handling of columns."

Heap-based buffer overflow in the xmlParseAttValueComplex function in parser.c in libxml2 before 2.7.0 allows context-dependent attackers to cause a denial of service (crash) or execute arbitrary code via a long XML entity name.

libxml2 2.6.32 and earlier does not properly detect recursion during entity expansion in an attribute value, which allows context-dependent attackers to cause a denial of service (memory and CPU consumption) via a crafted XML document.

WebCore in Apple Safari does not properly perform garbage collection of JavaScript document elements, which allows remote attackers to execute arbitrary code or cause a denial of service (heap corruption and application crash) via a reference to the ownerNode property of a copied CSSStyleSheet object of a STYLE element, as originally demonstrated on Apple iPhone before 2.0 and iPod touch before 2.0, a different vulnerability than CVE-2008-1590.