CVE-2007-4770: Icu-Project International Components For Unicode

Medium severity, CVSS 6.8. EPSS: 2.9% chance of exploitation in the next 30 days.

libicu in International Components for Unicode (ICU) 3.8.1 and earlier attempts to process backreferences to the nonexistent capture group zero (aka \0), which might allow context-dependent attackers to read from, or write to, out-of-bounds memory locations, related to corruption of REStackFrames.

Affected products

• Icu-Project International Components For Unicode: up to and including 3.8.1

Published 2008-01-29. Last modified 2026-06-16.