CVE-2006-4566: Mozilla Firefox

Medium severity, CVSS 5.0. EPSS: 4% chance of exploitation in the next 30 days.

Mozilla Firefox before 1.5.0.7, Thunderbird before 1.5.0.7, and SeaMonkey before 1.0.5 allows remote attackers to cause a denial of service (crash) via a malformed JavaScript regular expression that ends with a backslash in an unterminated character set ("[\\"), which leads to a buffer over-read.

Affected products

• Mozilla Firefox: up to and including 1.5.0.6
• Mozilla Seamonkey: up to and including 1.0.4
• Mozilla Thunderbird: up to and including 1.5.0.6

Published 2006-09-15. Last modified 2026-06-16.