CVE-2009-1096: Sun JDK

High severity, CVSS 10.0. EPSS: 8.2% chance of exploitation in the next 30 days.

Buffer overflow in unpack200 in Java SE Development Kit (JDK) and Java Runtime Environment (JRE) 5.0 Update 17 and earlier, and 6 Update 12 and earlier, allows remote attackers to access files or execute arbitrary code via a JAR file with crafted Pack200 headers.

Affected products

• Sun JDK: up to and including 1.5.0; version 1.5.0 only; up to and including 1.6.0; version 1.6.0 only
• Sun JRE: up to and including 1.5.0; version 1.5.0 only; up to and including 1.6.0; version 1.6.0 only

Published 2009-03-25. Last modified 2026-06-16.