CVE-2006-0294: Mozilla Firefox

High severity, CVSS 7.5. EPSS: 4.9% chance of exploitation in the next 30 days.

Mozilla Firefox before 1.5.0.1, Thunderbird 1.5 if running Javascript in mail, and SeaMonkey before 1.0 allow remote attackers to execute arbitrary code by changing an element's style from position:relative to position:static, which causes Gecko to operate on freed memory.

Affected products

• Mozilla Firefox: version 0.8 only; version 0.9 only; version 0.9.1 only; version 0.9.2 only; version 0.9.3 only; version 0.10 only; …
• Mozilla Seamonkey: version 1.0 only
• Mozilla Thunderbird: version 1.5 only

Published 2006-02-02. Last modified 2026-06-16.