CVE-2009-5065: Mark Pilgrim Feedparser

Medium severity, CVSS 4.3. EPSS: 4.5% chance of exploitation in the next 30 days.

Cross-site scripting (XSS) vulnerability in feedparser.py in Universal Feed Parser (aka feedparser or python-feedparser) before 5.0 allows remote attackers to inject arbitrary web script or HTML via vectors involving nested CDATA stanzas.

Affected products

• Mark Pilgrim Feedparser: up to and including 4.1; version 3.0 only; version 3.0.1 only; version 3.1 only; version 3.2 only; version 3.3 only; …

Published 2011-04-11. Last modified 2026-06-16.