CVE-2017-9233: Debian Linux

High severity, CVSS 7.5. EPSS: 8.7% chance of exploitation in the next 30 days.

XML External Entity vulnerability in libexpat 2.2.0 and earlier (Expat XML Parser Library) allows attackers to put the parser in an infinite loop using a malformed external entity definition from an external DTD.

Affected products

• Debian Debian Linux: version 8.0 only; version 9.0 only; version 10.0 only
• Libexpat Project Libexpat: up to and including 2.2.0
• Python Python: from 2.7.0, before 2.7.15 (fixed in 2.7.15); from 3.3.0, before 3.3.7 (fixed in 3.3.7); from 3.4.0, before 3.4.7 (fixed in 3.4.7); from 3.5.0, before 3.5.4 (fixed in 3.5.4); from 3.6.0, before 3.6.2 (fixed in 3.6.2)

Published 2017-07-25. Last modified 2026-10-08.