Vulnerability-Lookup

CVE-2026-54690 (GCVE-0-2026-54690)

Vulnerability from cvelistv5 – Published: 2026-07-28 21:42 – Updated: 2026-07-29 15:24

Title

datamodel-code-generator vulnerable to SSRF via JSON-Schema `$ref` to HTTP URL (silent by default)

Summary

datamodel-code-generator generates Pydantic v2 models, dataclasses, TypedDict, and msgspec.Struct from OpenAPI, JSON Schema, GraphQL, Avro, Protobuf, and raw JSON, YAML, or CSV. From 0.9.1 until 0.61.0, datamodel-code-generator silently dereferences attacker-controlled JSON Schema $ref HTTP or HTTPS URLs in src/datamodel_code_generator/parser/jsonschema.py through _get_ref_body, and the --allow-remote-refs gate can warn instead of blocking, allowing server-side request forgery through src/datamodel_code_generator/http.py. This issue is fixed in version 0.61.0.

Severity

8.2 (High)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-29 14:43 UTC

CWE

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

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/koxudaxi/datamodel-code-genera…	x_refsource_CONFIRM
https://github.com/koxudaxi/datamodel-code-genera…	x_refsource_MISC
https://github.com/koxudaxi/datamodel-code-genera…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
koxudaxi	datamodel-code-generator	Affected: >= 0.9.1, < 0.61.0	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-54690

Vulnerability from fkie_nvd - Published: 2026-07-28 22:17 - Updated: 2026-08-06 19:48

Severity

8.2 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/koxudaxi/datamodel-code-generator/commit/5fdba4a09f2d7a9996a504975b7ef7d63e3715bb	Patch
security-advisories@github.com	https://github.com/koxudaxi/datamodel-code-generator/releases/tag/0.61.0	Release Notes
security-advisories@github.com	https://github.com/koxudaxi/datamodel-code-generator/security/advisories/GHSA-954p-556p-r752	Exploit, Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/koxudaxi/datamodel-code-generator/security/advisories/GHSA-954p-556p-r752	Exploit, Vendor Advisory

Impacted products

	Vendor	Product	Version
	koxudaxi	datamodel-code-generator	*

JSON

To clipboard

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GHSA-954P-556P-R752

Vulnerability from github – Published: 2026-07-28 21:42 – Updated: 2026-07-28 21:42

Summary

datamodel-code-generator vulnerable to SSRF via JSON-Schema `$ref` to HTTP URL (silent by default)

Details

Summary

JSON-Schema $ref values pointing at HTTP or HTTPS URLs are silently dereferenced by datamodel-code-generator with no IP/host validation, no scheme allow-list, and redirects followed unconditionally. The --allow-remote-refs gate added in 0.56.0 defaults to None, which only emits a deprecation warning and then fetches the URL anyway; only explicit --allow-remote-refs=false blocks the request. The fetched body is parsed as a sub-schema and reflected verbatim into the generated .py source. As a result, any JSON-Schema document the developer feeds to datamodel-codegen — including documents authored by an attacker — can pivot to arbitrary internal addresses and leak the response into the generated code, with no developer cooperation beyond running the tool.

Details

Sink: src/datamodel_code_generator/parser/jsonschema.py, _get_ref_body (lines 4776–4793, at tag 0.60.1 / commit a321547e):

def _get_ref_body(self, resolved_ref: str) -> dict[str, YamlValue]:
    if is_url(resolved_ref):
        if not resolved_ref.startswith("file://") and self.http_local_ref_path is None:
            if self.allow_remote_refs is False:
                raise Error(f"Fetching remote $ref is disabled: {resolved_ref}...")
            if self.allow_remote_refs is None:
                warn_deprecated(                            # (A) warn only
                    "behavior.remote-ref-default",
                    details=f"Reference: {resolved_ref}",
                    stacklevel=2,
                )
        return self._get_ref_body_from_url(resolved_ref)    # (B) fetch fires
    return self._get_ref_body_from_remote(resolved_ref)

(A) emits a deprecation warning when allow_remote_refs is its default (None); execution falls through to (B).
(B) routes the URL through _get_text_from_url → get_body, the same fetcher described in other report — no IP validation, redirects followed.

The fetched body is then parsed as a sub-schema and merged into the model graph, so description, title, properties, etc. from the remote document end up in the generated .py source.

Only affects users who installed the [http] extra (pip install 'datamodel-code-generator[http]').

PoC

A self-contained one-file PoC is available here: https://gist.github.com/thegr1ffyn/562a6972d7dc3f2869458ae93fc608c0

Impact

Who is impacted. Anyone running datamodel-codegen on a JSON-Schema or OpenAPI document of uncertain provenance, with the [http] extra installed. Real-world scenarios:

Trojaned OpenAPI document. A public REST API publishes openapi.yaml. One $ref points at http://169.254.169.254/latest/meta-data/iam/security-credentials/<role>; running datamodel-codegen against the spec from an EC2 instance leaks the IAM credentials into the generated client.
Customer-supplied JSON Schema. A B2B SaaS auto-generates client code from customer-uploaded schemas. The customer adds an HTTP $ref to http://internal-admin:8080/users.json; the response (e.g. JSON user list) ends up in the generated Python the SaaS hands back to the customer.
CI on a private network. A PR adds schemas/inbound.json with an HTTP $ref pointed at a service reachable only from the CI cluster's VPC; the CI runner fetches it and the generated .py leaks the response in PR artifacts.

Higher real-world risk than the sibling CLI-flag SSRF (other SSRF in this report bundle) because the schema author chooses the destination — the developer doesn't have to type any URL.

Suggested fix.

Flip the default in parser/base.py: allow_remote_refs: bool = False, and remove the silent-fetch-with-warning fallback at parser/jsonschema.py:4786-4791.
When fetching is allowed, apply the same IP/host validation proposed for other submitted SSRF report to both the initial $ref URL and every redirect target.
Document HTTP $ref in a third-party schema as equivalent to running curl on the developer's host.

Maintainer resolution

This $ref report is fixed by the same shared HTTP fetcher hardening that resolved GHSA-rfr2-mq9m-x2qx. The code landed through the GHSA-rfr2 private security PR koxudaxi/datamodel-code-generator-ghsa-rfr2-mq9m-x2qx#1 and was merged into the public repository as 5fdba4a09f2d7a9996a504975b7ef7d63e3715bb. Follow-up generated-file and coverage fixes were merged in koxudaxi/datamodel-code-generator#3279 and docs were synced in #3280. The patched release is 0.61.0.

No separate net code diff remains in the GHSA-954 private PR because the shared HTTP fetcher patch is already present on main. This advisory remains separate because the affected entry point is remote JSON Schema/OpenAPI $ref resolution rather than direct CLI --url input.

The fix does not flip the --allow-remote-refs compatibility default in this patch. Instead, it mitigates the SSRF issue by blocking localhost, loopback, private, link-local, reserved, and other non-public network targets by default, validating every redirect target before it is fetched, and requiring --allow-private-network / allow_private_network=True for trusted internal schema endpoints. Remote $ref fetching remains controlled by --allow-remote-refs; non-public/internal targets additionally require --allow-private-network.

Submitted by: Hamza Haroon (thegr1ffyn)

Severity

8.2 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.60.2"
      },
      "package": {
        "ecosystem": "PyPI",
        "name": "datamodel-code-generator"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.9.1"
            },
            {
              "fixed": "0.61.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-54690"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-918"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-28T21:42:22Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Summary\n\nJSON-Schema `$ref` values pointing at HTTP or HTTPS URLs are silently dereferenced by `datamodel-code-generator` with no IP/host validation, no scheme allow-list, and redirects followed unconditionally. The `--allow-remote-refs` gate added in 0.56.0 defaults to `None`, which only emits a deprecation warning and then fetches the URL anyway; only explicit `--allow-remote-refs=false` blocks the request. The fetched body is parsed as a sub-schema and reflected verbatim into the generated `.py` source. As a result, any JSON-Schema document the developer feeds to `datamodel-codegen` \u2014 including documents authored by an attacker \u2014 can pivot to arbitrary internal addresses and leak the response into the generated code, with no developer cooperation beyond running the tool.\n\n### Details\n\nSink: `src/datamodel_code_generator/parser/jsonschema.py`, `_get_ref_body` (lines 4776\u20134793, at tag `0.60.1` / commit `a321547e`):\n\n```python\ndef _get_ref_body(self, resolved_ref: str) -\u003e dict[str, YamlValue]:\n    if is_url(resolved_ref):\n        if not resolved_ref.startswith(\"file://\") and self.http_local_ref_path is None:\n            if self.allow_remote_refs is False:\n                raise Error(f\"Fetching remote $ref is disabled: {resolved_ref}...\")\n            if self.allow_remote_refs is None:\n                warn_deprecated(                            # (A) warn only\n                    \"behavior.remote-ref-default\",\n                    details=f\"Reference: {resolved_ref}\",\n                    stacklevel=2,\n                )\n        return self._get_ref_body_from_url(resolved_ref)    # (B) fetch fires\n    return self._get_ref_body_from_remote(resolved_ref)\n```\n\n- (A) emits a deprecation warning when `allow_remote_refs` is its default (`None`); execution falls through to (B).\n- (B) routes the URL through `_get_text_from_url` \u2192 `get_body`, the same fetcher described in other report \u2014 no IP validation, redirects followed.\n\nThe fetched body is then parsed as a sub-schema and merged into the model graph, so `description`, `title`, `properties`, etc. from the remote document end up in the generated `.py` source.\n\nOnly affects users who installed the `[http]` extra (`pip install \u0027datamodel-code-generator[http]\u0027`).\n\n### PoC\n\nA self-contained one-file PoC is available here: https://gist.github.com/thegr1ffyn/562a6972d7dc3f2869458ae93fc608c0\n\n### Impact\n\n**Who is impacted.** Anyone running `datamodel-codegen` on a JSON-Schema or OpenAPI document of uncertain provenance, with the `[http]` extra installed. Real-world scenarios:\n\n1. **Trojaned OpenAPI document.** A public REST API publishes `openapi.yaml`. One `$ref` points at `http://169.254.169.254/latest/meta-data/iam/security-credentials/\u003crole\u003e`; running `datamodel-codegen` against the spec from an EC2 instance leaks the IAM credentials into the generated client.\n2. **Customer-supplied JSON Schema.** A B2B SaaS auto-generates client code from customer-uploaded schemas. The customer adds an HTTP `$ref` to `http://internal-admin:8080/users.json`; the response (e.g. JSON user list) ends up in the generated Python the SaaS hands back to the customer.\n3. **CI on a private network.** A PR adds `schemas/inbound.json` with an HTTP `$ref` pointed at a service reachable only from the CI cluster\u0027s VPC; the CI runner fetches it and the generated `.py` leaks the response in PR artifacts.\n\nHigher real-world risk than the sibling CLI-flag SSRF (other SSRF in this report bundle) because the *schema author* chooses the destination \u2014 the developer doesn\u0027t have to type any URL.\n\n**Suggested fix.**\n\n1. Flip the default in `parser/base.py`: `allow_remote_refs: bool = False`, and remove the silent-fetch-with-warning fallback at `parser/jsonschema.py:4786-4791`.\n2. When fetching is allowed, apply the same IP/host validation proposed for other submitted SSRF report to both the initial `$ref` URL and every redirect target.\n3. Document HTTP `$ref` in a third-party schema as equivalent to running `curl` on the developer\u0027s host.\n\n### Maintainer resolution\n\nThis `$ref` report is fixed by the same shared HTTP fetcher hardening that resolved GHSA-rfr2-mq9m-x2qx. The code landed through the GHSA-rfr2 private security PR koxudaxi/datamodel-code-generator-ghsa-rfr2-mq9m-x2qx#1 and was merged into the public repository as 5fdba4a09f2d7a9996a504975b7ef7d63e3715bb. Follow-up generated-file and coverage fixes were merged in koxudaxi/datamodel-code-generator#3279 and docs were synced in #3280. The patched release is 0.61.0.\n\nNo separate net code diff remains in the GHSA-954 private PR because the shared HTTP fetcher patch is already present on `main`. This advisory remains separate because the affected entry point is remote JSON Schema/OpenAPI `$ref` resolution rather than direct CLI `--url` input.\n\nThe fix does not flip the `--allow-remote-refs` compatibility default in this patch. Instead, it mitigates the SSRF issue by blocking localhost, loopback, private, link-local, reserved, and other non-public network targets by default, validating every redirect target before it is fetched, and requiring `--allow-private-network` / `allow_private_network=True` for trusted internal schema endpoints. Remote `$ref` fetching remains controlled by `--allow-remote-refs`; non-public/internal targets additionally require `--allow-private-network`.\n\nSubmitted by: Hamza Haroon (thegr1ffyn)",
  "id": "GHSA-954p-556p-r752",
  "modified": "2026-07-28T21:42:22Z",
  "published": "2026-07-28T21:42:22Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/koxudaxi/datamodel-code-generator/security/advisories/GHSA-954p-556p-r752"
    },
    {
      "type": "WEB",
      "url": "https://github.com/koxudaxi/datamodel-code-generator/commit/5fdba4a09f2d7a9996a504975b7ef7d63e3715bb"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/koxudaxi/datamodel-code-generator"
    },
    {
      "type": "WEB",
      "url": "https://github.com/koxudaxi/datamodel-code-generator/releases/tag/0.61.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "datamodel-code-generator vulnerable to SSRF via JSON-Schema `$ref` to HTTP URL (silent by default)"
}

PYSEC-2026-3560

Vulnerability from pysec - Published: 2026-08-04 11:34 - Updated: 2026-08-04 13:36

Details

Summary

Details

Sink: src/datamodel_code_generator/parser/jsonschema.py, _get_ref_body (lines 4776–4793, at tag 0.60.1 / commit a321547e):

def _get_ref_body(self, resolved_ref: str) -> dict[str, YamlValue]:
    if is_url(resolved_ref):
        if not resolved_ref.startswith("file://") and self.http_local_ref_path is None:
            if self.allow_remote_refs is False:
                raise Error(f"Fetching remote $ref is disabled: {resolved_ref}...")
            if self.allow_remote_refs is None:
                warn_deprecated(                            # (A) warn only
                    "behavior.remote-ref-default",
                    details=f"Reference: {resolved_ref}",
                    stacklevel=2,
                )
        return self._get_ref_body_from_url(resolved_ref)    # (B) fetch fires
    return self._get_ref_body_from_remote(resolved_ref)

(A) emits a deprecation warning when allow_remote_refs is its default (None); execution falls through to (B).
(B) routes the URL through _get_text_from_url → get_body, the same fetcher described in other report — no IP validation, redirects followed.

The fetched body is then parsed as a sub-schema and merged into the model graph, so description, title, properties, etc. from the remote document end up in the generated .py source.

Only affects users who installed the [http] extra (pip install 'datamodel-code-generator[http]').

PoC

A self-contained one-file PoC is available here: https://gist.github.com/thegr1ffyn/562a6972d7dc3f2869458ae93fc608c0

Impact

Who is impacted. Anyone running datamodel-codegen on a JSON-Schema or OpenAPI document of uncertain provenance, with the [http] extra installed. Real-world scenarios:

Trojaned OpenAPI document. A public REST API publishes openapi.yaml. One $ref points at http://169.254.169.254/latest/meta-data/iam/security-credentials/<role>; running datamodel-codegen against the spec from an EC2 instance leaks the IAM credentials into the generated client.
Customer-supplied JSON Schema. A B2B SaaS auto-generates client code from customer-uploaded schemas. The customer adds an HTTP $ref to http://internal-admin:8080/users.json; the response (e.g. JSON user list) ends up in the generated Python the SaaS hands back to the customer.
CI on a private network. A PR adds schemas/inbound.json with an HTTP $ref pointed at a service reachable only from the CI cluster's VPC; the CI runner fetches it and the generated .py leaks the response in PR artifacts.

Higher real-world risk than the sibling CLI-flag SSRF (other SSRF in this report bundle) because the schema author chooses the destination — the developer doesn't have to type any URL.

Suggested fix.

Flip the default in parser/base.py: allow_remote_refs: bool = False, and remove the silent-fetch-with-warning fallback at parser/jsonschema.py:4786-4791.
When fetching is allowed, apply the same IP/host validation proposed for other submitted SSRF report to both the initial $ref URL and every redirect target.
Document HTTP $ref in a third-party schema as equivalent to running curl on the developer's host.

Maintainer resolution

Submitted by: Hamza Haroon (thegr1ffyn)

Severity

8.2 (High)


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

Impacted products

Name	purl
datamodel-code-generator	pkg:pypi/datamodel-code-generator

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "datamodel-code-generator",
        "purl": "pkg:pypi/datamodel-code-generator"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.9.1"
            },
            {
              "fixed": "0.61.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.10.0",
        "0.10.1",
        "0.10.2",
        "0.10.3",
        "0.11.0",
        "0.11.1",
        "0.11.10",
        "0.11.11",
        "0.11.12",
        "0.11.13",
        "0.11.14",
        "0.11.15",
        "0.11.16",
        "0.11.17",
        "0.11.18",
        "0.11.19",
        "0.11.2",
        "0.11.20",
        "0.11.3",
        "0.11.4",
        "0.11.5",
        "0.11.6",
        "0.11.7",
        "0.11.8",
        "0.11.9",
        "0.12.0",
        "0.12.1",
        "0.12.2",
        "0.12.3",
        "0.13.0",
        "0.13.1",
        "0.13.2",
        "0.13.3",
        "0.13.4",
        "0.13.5",
        "0.14.0",
        "0.14.1",
        "0.15.0",
        "0.16.0",
        "0.16.1",
        "0.17.0",
        "0.17.1",
        "0.17.2",
        "0.18.0",
        "0.18.1",
        "0.19.0",
        "0.20.0",
        "0.21.0",
        "0.21.1",
        "0.21.2",
        "0.21.3",
        "0.21.4",
        "0.21.5",
        "0.22.0",
        "0.22.1",
        "0.23.0",
        "0.24.0",
        "0.24.1",
        "0.24.2",
        "0.25.0",
        "0.25.1",
        "0.25.2",
        "0.25.3",
        "0.25.4",
        "0.25.5",
        "0.25.6",
        "0.25.7",
        "0.25.8",
        "0.25.9",
        "0.26.0",
        "0.26.1",
        "0.26.2",
        "0.26.3",
        "0.26.4",
        "0.26.5",
        "0.27.0",
        "0.27.1",
        "0.27.2",
        "0.27.3",
        "0.28.0",
        "0.28.1",
        "0.28.2",
        "0.28.3",
        "0.28.4",
        "0.28.5",
        "0.29.0",
        "0.30.0",
        "0.30.1",
        "0.30.2",
        "0.31.0",
        "0.31.1",
        "0.31.2",
        "0.32.0",
        "0.33.0",
        "0.34.0",
        "0.35.0",
        "0.36.0",
        "0.37.0",
        "0.38.0",
        "0.39.0",
        "0.40.0",
        "0.41.0",
        "0.42.0",
        "0.42.1",
        "0.42.2",
        "0.43.0",
        "0.43.1",
        "0.44.0",
        "0.45.0",
        "0.46.0",
        "0.47.0",
        "0.48.0",
        "0.49.0",
        "0.50.0",
        "0.51.0",
        "0.52.0",
        "0.52.1",
        "0.52.2",
        "0.53.0",
        "0.54.0",
        "0.54.1",
        "0.55.0",
        "0.56.0",
        "0.56.1",
        "0.57.0",
        "0.58.0",
        "0.59.0",
        "0.59.1",
        "0.60.0",
        "0.60.1",
        "0.60.2",
        "0.9.1",
        "0.9.2",
        "0.9.3",
        "0.9.4"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-54690",
    "GHSA-954p-556p-r752"
  ],
  "details": "### Summary\n\nJSON-Schema `$ref` values pointing at HTTP or HTTPS URLs are silently dereferenced by `datamodel-code-generator` with no IP/host validation, no scheme allow-list, and redirects followed unconditionally. The `--allow-remote-refs` gate added in 0.56.0 defaults to `None`, which only emits a deprecation warning and then fetches the URL anyway; only explicit `--allow-remote-refs=false` blocks the request. The fetched body is parsed as a sub-schema and reflected verbatim into the generated `.py` source. As a result, any JSON-Schema document the developer feeds to `datamodel-codegen` \u2014 including documents authored by an attacker \u2014 can pivot to arbitrary internal addresses and leak the response into the generated code, with no developer cooperation beyond running the tool.\n\n### Details\n\nSink: `src/datamodel_code_generator/parser/jsonschema.py`, `_get_ref_body` (lines 4776\u20134793, at tag `0.60.1` / commit `a321547e`):\n\n```python\ndef _get_ref_body(self, resolved_ref: str) -\u003e dict[str, YamlValue]:\n    if is_url(resolved_ref):\n        if not resolved_ref.startswith(\"file://\") and self.http_local_ref_path is None:\n            if self.allow_remote_refs is False:\n                raise Error(f\"Fetching remote $ref is disabled: {resolved_ref}...\")\n            if self.allow_remote_refs is None:\n                warn_deprecated(                            # (A) warn only\n                    \"behavior.remote-ref-default\",\n                    details=f\"Reference: {resolved_ref}\",\n                    stacklevel=2,\n                )\n        return self._get_ref_body_from_url(resolved_ref)    # (B) fetch fires\n    return self._get_ref_body_from_remote(resolved_ref)\n```\n\n- (A) emits a deprecation warning when `allow_remote_refs` is its default (`None`); execution falls through to (B).\n- (B) routes the URL through `_get_text_from_url` \u2192 `get_body`, the same fetcher described in other report \u2014 no IP validation, redirects followed.\n\nThe fetched body is then parsed as a sub-schema and merged into the model graph, so `description`, `title`, `properties`, etc. from the remote document end up in the generated `.py` source.\n\nOnly affects users who installed the `[http]` extra (`pip install \u0027datamodel-code-generator[http]\u0027`).\n\n### PoC\n\nA self-contained one-file PoC is available here: https://gist.github.com/thegr1ffyn/562a6972d7dc3f2869458ae93fc608c0\n\n### Impact\n\n**Who is impacted.** Anyone running `datamodel-codegen` on a JSON-Schema or OpenAPI document of uncertain provenance, with the `[http]` extra installed. Real-world scenarios:\n\n1. **Trojaned OpenAPI document.** A public REST API publishes `openapi.yaml`. One `$ref` points at `http://169.254.169.254/latest/meta-data/iam/security-credentials/\u003crole\u003e`; running `datamodel-codegen` against the spec from an EC2 instance leaks the IAM credentials into the generated client.\n2. **Customer-supplied JSON Schema.** A B2B SaaS auto-generates client code from customer-uploaded schemas. The customer adds an HTTP `$ref` to `http://internal-admin:8080/users.json`; the response (e.g. JSON user list) ends up in the generated Python the SaaS hands back to the customer.\n3. **CI on a private network.** A PR adds `schemas/inbound.json` with an HTTP `$ref` pointed at a service reachable only from the CI cluster\u0027s VPC; the CI runner fetches it and the generated `.py` leaks the response in PR artifacts.\n\nHigher real-world risk than the sibling CLI-flag SSRF (other SSRF in this report bundle) because the *schema author* chooses the destination \u2014 the developer doesn\u0027t have to type any URL.\n\n**Suggested fix.**\n\n1. Flip the default in `parser/base.py`: `allow_remote_refs: bool = False`, and remove the silent-fetch-with-warning fallback at `parser/jsonschema.py:4786-4791`.\n2. When fetching is allowed, apply the same IP/host validation proposed for other submitted SSRF report to both the initial `$ref` URL and every redirect target.\n3. Document HTTP `$ref` in a third-party schema as equivalent to running `curl` on the developer\u0027s host.\n\n### Maintainer resolution\n\nThis `$ref` report is fixed by the same shared HTTP fetcher hardening that resolved GHSA-rfr2-mq9m-x2qx. The code landed through the GHSA-rfr2 private security PR koxudaxi/datamodel-code-generator-ghsa-rfr2-mq9m-x2qx#1 and was merged into the public repository as 5fdba4a09f2d7a9996a504975b7ef7d63e3715bb. Follow-up generated-file and coverage fixes were merged in koxudaxi/datamodel-code-generator#3279 and docs were synced in #3280. The patched release is 0.61.0.\n\nNo separate net code diff remains in the GHSA-954 private PR because the shared HTTP fetcher patch is already present on `main`. This advisory remains separate because the affected entry point is remote JSON Schema/OpenAPI `$ref` resolution rather than direct CLI `--url` input.\n\nThe fix does not flip the `--allow-remote-refs` compatibility default in this patch. Instead, it mitigates the SSRF issue by blocking localhost, loopback, private, link-local, reserved, and other non-public network targets by default, validating every redirect target before it is fetched, and requiring `--allow-private-network` / `allow_private_network=True` for trusted internal schema endpoints. Remote `$ref` fetching remains controlled by `--allow-remote-refs`; non-public/internal targets additionally require `--allow-private-network`.\n\nSubmitted by: Hamza Haroon (thegr1ffyn)",
  "id": "PYSEC-2026-3560",
  "modified": "2026-08-04T13:36:15.621364Z",
  "published": "2026-08-04T11:34:44.428988Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/koxudaxi/datamodel-code-generator/security/advisories/GHSA-954p-556p-r752"
    },
    {
      "type": "WEB",
      "url": "https://github.com/koxudaxi/datamodel-code-generator/commit/5fdba4a09f2d7a9996a504975b7ef7d63e3715bb"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/koxudaxi/datamodel-code-generator"
    },
    {
      "type": "WEB",
      "url": "https://github.com/koxudaxi/datamodel-code-generator/releases/tag/0.61.0"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/datamodel-code-generator"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-954p-556p-r752"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-54690"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "datamodel-code-generator vulnerable to SSRF via JSON-Schema `$ref` to HTTP URL (silent by default)"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-54690 (GCVE-0-2026-54690)

FKIE_CVE-2026-54690

GHSA-954P-556P-R752

Summary

Details

PoC

Impact

Maintainer resolution

PYSEC-2026-3560

Summary

Details

PoC

Impact

Maintainer resolution

Tags

Sightings

Nomenclature

Related by attack behaviour