CVE-2008-1721: Canonical Ubuntu Linux

High severity, CVSS 7.5. EPSS: 22.6% chance of exploitation in the next 30 days.

Integer signedness error in the zlib extension module in Python 2.5.2 and earlier allows remote attackers to execute arbitrary code via a negative signed integer, which triggers insufficient memory allocation and a buffer overflow.

Affected products

• Canonical Ubuntu Linux: version 6.06 only; version 7.04 only; version 7.10 only; version 8.04 only
• Debian Debian Linux: version 4.0 only
• Python Python: from 2.4.0, before 2.4.6 (fixed in 2.4.6); from 2.5.0, up to and including 2.5.2

Published 2008-04-10. Last modified 2026-06-16.