CVE-2026-58501: Zeep SSRF because Settings.forbid_external is not enforced

Severity: medium (CVSS 5.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-08 · updated 2026-10-25
Weakness: CWE-918

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.

Affected products

mvantellingen python-zeep: from 4.0.0 before 4.3.3 — fixed in 4.3.3

How to fix

Upgrade to a fixed version: mvantellingen python-zeep 4.3.3. Check the vendor advisory for mitigations.

References

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

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