Microsoft Internet Explorer 5 SP4 and 6 do not properly garbage collect when "multiple imports are used on a styleSheets collection" to construct a chain of Cascading Style Sheets (CSS), which allows remote attackers to execute arbitrary code via unspecified vectors.
- http://securityreason.com/securityalert/1343
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2006/ms06-042
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