Vulnerability-Lookup

PYSEC-2026-2323

Vulnerability from pysec - Published: 2026-07-08 20:16 - Updated: 2026-07-13 05:52

Details

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.

Severity

5.9 (Medium)


                  
                    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Impacted products

Name	purl
zeep	pkg:pypi/zeep

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {},
      "package": {
        "ecosystem": "PyPI",
        "name": "zeep",
        "purl": "pkg:pypi/zeep"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.0.0"
            },
            {
              "fixed": "4.3.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.0.0",
        "4.1.0",
        "4.2.0",
        "4.2.1",
        "4.3.0",
        "4.3.1",
        "4.3.2"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-58501",
    "GHSA-4cc2-g9w2-fhf6"
  ],
  "details": "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.",
  "id": "PYSEC-2026-2323",
  "modified": "2026-07-13T05:52:39.838266Z",
  "published": "2026-07-08T20:16:55.323Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/mvantellingen/python-zeep/releases/tag/4.3.3"
    },
    {
      "type": "FIX",
      "url": "https://github.com/mvantellingen/python-zeep/commit/83eb07bc6c84d841329d4f88856fecdba86f753e"
    },
    {
      "type": "FIX",
      "url": "https://github.com/mvantellingen/python-zeep/security/advisories/GHSA-4cc2-g9w2-fhf6"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-58501 (GCVE-0-2026-58501)

Vulnerability from cvelistv5 – Published: 2026-07-08 19:31 – Updated: 2026-07-09 13:20

Title

Zeep SSRF because Settings.forbid_external is not enforced

Summary

Severity

5.9 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-918 - Server-Side Request Forgery (SSRF)

Assigner

GitHub_M

References

3 references

URL	Tags
https://github.com/mvantellingen/python-zeep/secu…	x_refsource_CONFIRM
https://github.com/mvantellingen/python-zeep/comm…	x_refsource_MISC
https://github.com/mvantellingen/python-zeep/rele…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
mvantellingen	python-zeep	Affected: >= 4.0.0, < 4.3.3

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-58501",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-09T13:20:37.552267Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-09T13:20:46.160Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "python-zeep",
          "vendor": "mvantellingen",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 4.0.0, \u003c 4.3.3"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-918",
              "description": "CWE-918: Server-Side Request Forgery (SSRF)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-08T19:31:55.937Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/mvantellingen/python-zeep/security/advisories/GHSA-4cc2-g9w2-fhf6",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/mvantellingen/python-zeep/security/advisories/GHSA-4cc2-g9w2-fhf6"
        },
        {
          "name": "https://github.com/mvantellingen/python-zeep/commit/83eb07bc6c84d841329d4f88856fecdba86f753e",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/mvantellingen/python-zeep/commit/83eb07bc6c84d841329d4f88856fecdba86f753e"
        },
        {
          "name": "https://github.com/mvantellingen/python-zeep/releases/tag/4.3.3",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/mvantellingen/python-zeep/releases/tag/4.3.3"
        }
      ],
      "source": {
        "advisory": "GHSA-4cc2-g9w2-fhf6",
        "discovery": "UNKNOWN"
      },
      "title": "Zeep SSRF because Settings.forbid_external is not enforced"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-58501",
    "datePublished": "2026-07-08T19:31:55.937Z",
    "dateReserved": "2026-06-30T20:21:25.813Z",
    "dateUpdated": "2026-07-09T13:20:46.160Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

GHSA-4CC2-G9W2-FHF6

Vulnerability from github – Published: 2026-06-19 22:10 – Updated: 2026-06-19 22:10

Summary

Zeep: Server-Side Request Forgery (SSRF)

Details

Summary

When parsing a WSDL or XSD document, python-zeep follows transitive references — xsd:import, xsd:include, wsdl:import, and lxml entity/DTD resolution — and will fetch http/https URLs found in those references. The Settings.forbid_external option, intended to disable this transitive remote fetching, was defined but not wired to any logic from version 4.0.0 through 4.3.2 (a regression introduced when zeep moved off defusedxml in 4.0). As a result, setting forbid_external=True had no effect, and applications that processed untrusted or attacker-influenced WSDL/XSD documents could be coerced into making server-side requests to arbitrary URLs (SSRF).

Impact

Server-Side Request Forgery (SSRF), CWE-918.

An attacker who can supply or influence the contents of a WSDL/XSD that an application loads with zeep can embed an import/include reference (e.g. <xsd:import schemaLocation="http://169.254.169.254/...">) pointing at an internal or otherwise sensitive endpoint. When zeep parses the document it transitively fetches that URL using the configured transport, causing the application to issue outbound requests to attacker-chosen destinations. This can be used to reach internal-only services, cloud metadata endpoints, or other hosts not directly reachable by the attacker, and may disclose response timing/behaviour.

Impacted users are those who:

load WSDL/XSD documents that are untrusted or whose import targets an attacker can control, and/or
relied on forbid_external=True as a security control — in 4.0.0–4.3.2 that setting silently did nothing, so the protection users believed they had was not in effect.

Note the default was (and remains) forbid_external=False, i.e. transitive remote fetching is permitted by default; the security defect is specifically that the opt-out control was non-functional.

Patches

Fixed in python-zeep 4.3.3. The forbid_external setting is now enforced: when set to True, zeep refuses to transitively fetch http/https resources via xsd:import, xsd:include, wsdl:import, or lxml entity/DTD resolution, raising zeep.exceptions.ExternalReferenceForbidden. The user-supplied entry-point WSDL/schema URL is still loaded.

Affected versions: >= 4.0.0, < 4.3.3.

Upgrade to 4.3.3 (or later) and set forbid_external=True when loading documents from untrusted sources:

from zeep import Client, Settings

settings = Settings(forbid_external=True)
client = Client("https://untrusted.example/service?wsdl", settings=settings)

Workarounds

If you cannot upgrade to 4.3.3:

Do not load untrusted WSDL/XSD documents, and avoid loading WSDLs whose import/include targets can be influenced by untrusted input.
Vendor the schema locally: pre-fetch and review the WSDL and all of its imported schemas, then load them from local files (e.g. file:// paths) so no remote fetching occurs at parse time.
Restrict egress at the network layer: block outbound traffic from the host/process to internal ranges and metadata endpoints (e.g. 169.254.169.254, RFC1918 ranges) so SSRF attempts cannot reach sensitive targets.
Use a restrictive custom Transport: subclass the zeep transport and reject/allow-list URLs in load() so disallowed hosts are never fetched.

Severity

5.9 (Medium)


                  
                    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "zeep"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.0.0"
            },
            {
              "fixed": "4.3.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-918"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-19T22:10:26Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "## Summary\n\nWhen parsing a WSDL or XSD document, python-zeep follows transitive references \u2014 xsd:import, xsd:include, wsdl:import, and lxml entity/DTD resolution \u2014 and will fetch http/https URLs found in those references. The Settings.forbid_external option, intended to disable this transitive remote fetching, was defined but not wired to any logic from version 4.0.0 through 4.3.2 (a regression introduced when zeep moved off defusedxml in 4.0). As a result, setting `forbid_external=True` had no effect, and applications that processed untrusted or attacker-influenced WSDL/XSD documents could be coerced into making server-side requests to arbitrary URLs (SSRF).\n\n## Impact\n\nServer-Side Request Forgery (SSRF), CWE-918.\n\nAn attacker who can supply or influence the contents of a WSDL/XSD that an application loads with zeep can embed an import/include reference (e.g. `\u003cxsd:import schemaLocation=\"http://169.254.169.254/...\"\u003e`) pointing at an internal or otherwise sensitive endpoint. When zeep parses the document it transitively fetches that URL using the configured transport, causing the application to issue outbound requests to attacker-chosen destinations. This can be used to reach internal-only services, cloud metadata endpoints, or other hosts not directly reachable by the attacker, and may disclose response timing/behaviour.\n\nImpacted users are those who:\n\n- load WSDL/XSD documents that are untrusted or whose import targets an attacker can control, and/or\n- relied on `forbid_external=True` as a security control \u2014 in 4.0.0\u20134.3.2 that setting silently did nothing, so the protection users believed they had was not in effect.\n\nNote the default was (and remains) `forbid_external=False`, i.e. transitive remote fetching is permitted by default; the security defect is specifically that the opt-out control was non-functional.\n\n## Patches\n\nFixed in python-zeep 4.3.3. The forbid_external setting is now enforced: when set to True, zeep refuses to transitively fetch http/https resources via `xsd:import`, `xsd:include`, `wsdl:import`, or lxml entity/DTD resolution, raising `zeep.exceptions.ExternalReferenceForbidden`. The user-supplied entry-point WSDL/schema URL is still loaded.\n\nAffected versions: \u003e= 4.0.0, \u003c 4.3.3.\n\nUpgrade to 4.3.3 (or later) and set forbid_external=True when loading documents from untrusted sources:\n\n```python\nfrom zeep import Client, Settings\n\nsettings = Settings(forbid_external=True)\nclient = Client(\"https://untrusted.example/service?wsdl\", settings=settings)\n```\n\n## Workarounds\n\nIf you cannot upgrade to 4.3.3:\n\n- Do not load untrusted WSDL/XSD documents, and avoid loading WSDLs whose import/include targets can be influenced by untrusted input.\n- Vendor the schema locally: pre-fetch and review the WSDL and all of its imported schemas, then load them from local files (e.g. file:// paths) so no remote fetching occurs at parse\n  time.\n- Restrict egress at the network layer: block outbound traffic from the host/process to internal ranges and metadata endpoints (e.g. 169.254.169.254, RFC1918 ranges) so SSRF attempts\n  cannot reach sensitive targets.\n- Use a restrictive custom Transport: subclass the zeep transport and reject/allow-list URLs in load() so disallowed hosts are never fetched.",
  "id": "GHSA-4cc2-g9w2-fhf6",
  "modified": "2026-06-19T22:10:26Z",
  "published": "2026-06-19T22:10:26Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/mvantellingen/python-zeep/security/advisories/GHSA-4cc2-g9w2-fhf6"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mvantellingen/python-zeep/commit/83eb07bc6c84d841329d4f88856fecdba86f753e"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/mvantellingen/python-zeep"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mvantellingen/python-zeep/releases/tag/4.3.3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Zeep: Server-Side Request Forgery (SSRF)"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

PYSEC-2026-2323

CVE-2026-58501 (GCVE-0-2026-58501)

GHSA-4CC2-G9W2-FHF6

Summary

Impact

Patches

Workarounds

Tags

Sightings

Nomenclature