GHSA-4cc2-g9w2-fhf6: zeep (CVE-2026-58501)

Package	Ecosystem	Affected	Fixed in
zeep	PyPI	>=4.0.0, <4.3.3	4.3.3

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Zeep versions 4.0.0 through 4.3.2 are vulnerable to server-side request forgery when parsing WSDL or XSD documents. The forbid_external setting had no effect in these versions, so an attacker who can supply or influence a WSDL/XSD document can make the application issue requests to arbitrary URLs, including internal services. Upgrade to zeep 4.3.3 or later, and set forbid_external=True when loading documents from untrusted sources.

Written 6 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
5.9	Medium	3.1	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0041, the 35th percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 15:04 UTC First seen by agentprime
31 Oct 2026, 15:04 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.