CVE-2011-1156: Mark Pilgrim Feedparser

Medium severity, CVSS 5.0. EPSS: 3.3% chance of exploitation in the next 30 days.

feedparser.py in Universal Feed Parser (aka feedparser or python-feedparser) before 5.0.1 allows remote attackers to cause a denial of service (application crash) via a malformed DOCTYPE declaration.

Affected products

• Mark Pilgrim Feedparser: up to and including 5.0; 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.