Vulnerability-Lookup

CVE-2026-55403 (GCVE-0-2026-55403)

Vulnerability from cvelistv5 – Published: 2026-07-28 21:31 – Updated: 2026-07-29 12:46

Title

datamodel-code-generator: Authorization / request headers leaked to cross-origin redirect target when fetching remote schemas

Summary

datamodel-code-generator generates Python data models from schema definitions. Prior to 0.63.0, src/datamodel_code_generator/http.py get_body reuses Authorization, Cookie, and Proxy-Authorization headers when following cross-origin redirects while fetching remote schemas, allowing credentials scoped to one schema host to be leaked to another redirect target. This issue is fixed in version 0.63.0.

Severity

3.7 (Low)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-29 12:45 UTC

CWE

CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')

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: < 0.63.0	guessed

Show details on NVD website

JSON

To clipboard

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}

FKIE_CVE-2026-55403

Vulnerability from fkie_nvd - Published: 2026-07-28 22:17 - Updated: 2026-07-30 20:02

Severity

3.7 (Low) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/koxudaxi/datamodel-code-generator/commit/a585c037c8307b7aae815de193b7fe1c4c44994b
	security-advisories@github.com	https://github.com/koxudaxi/datamodel-code-generator/releases/tag/0.63.0
	security-advisories@github.com	https://github.com/koxudaxi/datamodel-code-generator/security/advisories/GHSA-r5vv-ff45-prp2
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/koxudaxi/datamodel-code-generator/security/advisories/GHSA-r5vv-ff45-prp2

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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      "affectedData": [
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          "product": "datamodel-code-generator",
          "vendor": "koxudaxi",
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    }
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GHSA-R5VV-FF45-PRP2

Vulnerability from github – Published: 2026-07-28 21:32 – Updated: 2026-07-28 21:32

Summary

datamodel-code-generator: Authorization / request headers leaked to cross-origin redirect target when fetching remote schemas

Details

Summary

When datamodel-code-generator fetches a remote schema and follows an HTTP redirect, it re-sends the original request headers, including any Authorization header, to the redirect target even when the redirect changes origin (host/port/scheme). Credentials that an operator scoped to a trusted schema host are therefore forwarded to an attacker-controlled or otherwise different host, leaking them.

Details

In src/datamodel_code_generator/http.py, get_body() follows redirects manually and re-issues each hop with the same headers argument, with no check that the origin is unchanged:

for redirect_count in range(MAX_HTTP_REDIRECTS + 1):
    _validate_url_for_fetch(current_url, allow_private_network=allow_private_network)
    response = httpx.get(current_url, headers=headers, follow_redirects=False, ...)  # same headers every hop
    if (redirect_url := _get_redirect_url(httpx, current_url, response)) is None:
        break
    current_url = redirect_url

Browsers and HTTP clients such as requests/httpx strip Authorization when a redirect crosses origin; here it is preserved unconditionally. Headers are operator-supplied via --http-headers (and credentials can also arrive through --url userinfo), so a redirect from the trusted host to any other host discloses them.

PoC

Self-contained reproducer: https://gist.github.com/thegr1ffyn/ade3035d7f2be95e16f11698259cdbc2
Host A (the trusted schema host) 302-redirects to host B (a different origin) which records received headers; the request carries an auth token scoped to A.

(The PoC uses loopback servers; allow_private_network=True is only to avoid the separate SSRF guard blocking loopback and has no bearing on the leak.)

Impact

Exposure of sensitive information to an unauthorized actor (CWE-200). Affects operators who pass authentication headers/credentials to fetch a remote schema (--http-headers, --url with userinfo) when the configured host issues a redirect to a different origin — e.g. a compromised or open-redirect-prone schema host, or a redirect chain influenced by an attacker-supplied $ref. The leaked credential can then be replayed against the trusted host. This is a credential-scoping weakness secondary to, and in the same component as, the project's other SSRF hardening.

Suggested remediation

When a redirect changes the origin (scheme/host/port), drop Authorization and other sensitive headers before following it, matching the behavior of mainstream HTTP clients.

Maintainer status

Confirmed by maintainer review and regression tests. The private fix PR was merged and released in 0.63.0: https://github.com/koxudaxi/datamodel-code-generator-ghsa-r5vv-ff45-prp2/pull/1

Fix summary: strip Authorization, Cookie, and Proxy-Authorization headers when a redirect crosses origin; preserve headers for same-origin redirects.

Release status: fixed in 0.63.0; 0.62.0 and earlier are affected.

Validation: uv run --group test --extra http pytest tests/test_http.py passed locally for the redirect regression coverage; uv run --group fix ruff check src/datamodel_code_generator/http.py tests/test_http.py passed.

Submitted by: Hamza Haroon (thegr1ffyn)

Severity

3.7 (Low)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.62.0"
      },
      "package": {
        "ecosystem": "PyPI",
        "name": "datamodel-code-generator"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.63.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-55403"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-200",
      "CWE-601"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-28T21:32:08Z",
    "nvd_published_at": null,
    "severity": "LOW"
  },
  "details": "### Summary\n\nWhen `datamodel-code-generator` fetches a remote schema and follows an HTTP redirect, it re-sends the original request headers, including any `Authorization` header, to the redirect target even when the redirect changes origin (host/port/scheme). Credentials that an operator scoped to a trusted schema host are therefore forwarded to an attacker-controlled or otherwise different host, leaking them.\n\n### Details\n\nIn `src/datamodel_code_generator/http.py`, `get_body()` follows redirects manually and re-issues each hop with the same `headers` argument, with no check that the origin is unchanged:\n\n```python\nfor redirect_count in range(MAX_HTTP_REDIRECTS + 1):\n    _validate_url_for_fetch(current_url, allow_private_network=allow_private_network)\n    response = httpx.get(current_url, headers=headers, follow_redirects=False, ...)  # same headers every hop\n    if (redirect_url := _get_redirect_url(httpx, current_url, response)) is None:\n        break\n    current_url = redirect_url\n```\n\nBrowsers and HTTP clients such as `requests`/`httpx` strip `Authorization` when a redirect crosses origin; here it is preserved unconditionally. Headers are operator-supplied via `--http-headers` (and credentials can also arrive through `--url` userinfo), so a redirect from the trusted host to any other host discloses them.\n\n### PoC\n\nSelf-contained reproducer: https://gist.github.com/thegr1ffyn/ade3035d7f2be95e16f11698259cdbc2  \nHost A (the trusted schema host) 302-redirects to host B (a different origin) which records received headers; the request carries an auth token scoped to A. \n\n(The PoC uses loopback servers; `allow_private_network=True` is only to avoid the separate SSRF guard blocking loopback and has no bearing on the leak.)\n\n### Impact\n\nExposure of sensitive information to an unauthorized actor (CWE-200). Affects operators who pass authentication headers/credentials to fetch a remote schema (`--http-headers`, `--url` with userinfo) when the configured host issues a redirect to a different origin \u2014 e.g. a compromised or open-redirect-prone schema host, or a redirect chain influenced by an attacker-supplied `$ref`. The leaked credential can then be replayed against the trusted host. This is a credential-scoping weakness secondary to, and in the same component as, the project\u0027s other SSRF hardening.\n\n### Suggested remediation\n\nWhen a redirect changes the origin (scheme/host/port), drop `Authorization` and other sensitive headers before following it, matching the behavior of mainstream HTTP clients.\n\n### Maintainer status\n\nConfirmed by maintainer review and regression tests. The private fix PR was merged and released in `0.63.0`: https://github.com/koxudaxi/datamodel-code-generator-ghsa-r5vv-ff45-prp2/pull/1\n\nFix summary: strip `Authorization`, `Cookie`, and `Proxy-Authorization` headers when a redirect crosses origin; preserve headers for same-origin redirects.\n\nRelease status: fixed in `0.63.0`; `0.62.0` and earlier are affected.\n\nValidation: `uv run --group test --extra http pytest tests/test_http.py` passed locally for the redirect regression coverage; `uv run --group fix ruff check src/datamodel_code_generator/http.py tests/test_http.py` passed.\n\nSubmitted by: Hamza Haroon (thegr1ffyn)",
  "id": "GHSA-r5vv-ff45-prp2",
  "modified": "2026-07-28T21:32:08Z",
  "published": "2026-07-28T21:32:08Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/koxudaxi/datamodel-code-generator/security/advisories/GHSA-r5vv-ff45-prp2"
    },
    {
      "type": "WEB",
      "url": "https://github.com/koxudaxi/datamodel-code-generator/commit/a585c037c8307b7aae815de193b7fe1c4c44994b"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/koxudaxi/datamodel-code-generator"
    },
    {
      "type": "WEB",
      "url": "https://github.com/koxudaxi/datamodel-code-generator/releases/tag/0.63.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "datamodel-code-generator: Authorization / request headers leaked to cross-origin redirect target when fetching remote schemas"
}

OPENSUSE-SU-2026:11538-1

Vulnerability from csaf_opensuse - Published: 2026-08-18 00:00 - Updated: 2026-09-17 17:20

Summary

python313-datamodel-code-generator-0.72.3-1.1 on GA media

Severity

Moderate

Scope

3 vulnerabilities in this advisory, including CVE-2026-55403.

CVE-2026-55403

3.7 (Low)


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

Recommended: 8 products

Open the full advisory

PYSEC-2026-3563

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

Details

Summary

Details

In src/datamodel_code_generator/http.py, get_body() follows redirects manually and re-issues each hop with the same headers argument, with no check that the origin is unchanged:

for redirect_count in range(MAX_HTTP_REDIRECTS + 1):
    _validate_url_for_fetch(current_url, allow_private_network=allow_private_network)
    response = httpx.get(current_url, headers=headers, follow_redirects=False, ...)  # same headers every hop
    if (redirect_url := _get_redirect_url(httpx, current_url, response)) is None:
        break
    current_url = redirect_url

PoC

(The PoC uses loopback servers; allow_private_network=True is only to avoid the separate SSRF guard blocking loopback and has no bearing on the leak.)

Impact

Suggested remediation

When a redirect changes the origin (scheme/host/port), drop Authorization and other sensitive headers before following it, matching the behavior of mainstream HTTP clients.

Maintainer status

Confirmed by maintainer review and regression tests. The private fix PR was merged and released in 0.63.0: https://github.com/koxudaxi/datamodel-code-generator-ghsa-r5vv-ff45-prp2/pull/1

Fix summary: strip Authorization, Cookie, and Proxy-Authorization headers when a redirect crosses origin; preserve headers for same-origin redirects.

Release status: fixed in 0.63.0; 0.62.0 and earlier are affected.

Submitted by: Hamza Haroon (thegr1ffyn)

Severity

3.7 (Low)


                  
                    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/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"
            },
            {
              "fixed": "0.63.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.0.1",
        "0.0.2",
        "0.0.3",
        "0.0.4",
        "0.0.5",
        "0.0.6",
        "0.1.0",
        "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",
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        "0.2.11",
        "0.2.12",
        "0.2.13",
        "0.2.14",
        "0.2.15",
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        "0.21.5",
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        "0.25.3",
        "0.25.4",
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        "0.26.0",
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        "0.33.0",
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        "0.5.1",
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        "0.5.39",
        "0.5.4",
        "0.5.5",
        "0.5.6",
        "0.5.7",
        "0.5.8",
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        "0.50.0",
        "0.51.0",
        "0.52.0",
        "0.52.1",
        "0.52.2",
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        "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",
        "0.6.0",
        "0.6.1",
        "0.6.10",
        "0.6.11",
        "0.6.12",
        "0.6.13",
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        "0.6.15",
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        "0.6.19",
        "0.6.2",
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        "0.6.26",
        "0.6.3",
        "0.6.4",
        "0.6.5",
        "0.6.6",
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        "0.60.1",
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      ]
    }
  ],
  "aliases": [
    "CVE-2026-55403",
    "GHSA-r5vv-ff45-prp2"
  ],
  "details": "### Summary\n\nWhen `datamodel-code-generator` fetches a remote schema and follows an HTTP redirect, it re-sends the original request headers, including any `Authorization` header, to the redirect target even when the redirect changes origin (host/port/scheme). Credentials that an operator scoped to a trusted schema host are therefore forwarded to an attacker-controlled or otherwise different host, leaking them.\n\n### Details\n\nIn `src/datamodel_code_generator/http.py`, `get_body()` follows redirects manually and re-issues each hop with the same `headers` argument, with no check that the origin is unchanged:\n\n```python\nfor redirect_count in range(MAX_HTTP_REDIRECTS + 1):\n    _validate_url_for_fetch(current_url, allow_private_network=allow_private_network)\n    response = httpx.get(current_url, headers=headers, follow_redirects=False, ...)  # same headers every hop\n    if (redirect_url := _get_redirect_url(httpx, current_url, response)) is None:\n        break\n    current_url = redirect_url\n```\n\nBrowsers and HTTP clients such as `requests`/`httpx` strip `Authorization` when a redirect crosses origin; here it is preserved unconditionally. Headers are operator-supplied via `--http-headers` (and credentials can also arrive through `--url` userinfo), so a redirect from the trusted host to any other host discloses them.\n\n### PoC\n\nSelf-contained reproducer: https://gist.github.com/thegr1ffyn/ade3035d7f2be95e16f11698259cdbc2  \nHost A (the trusted schema host) 302-redirects to host B (a different origin) which records received headers; the request carries an auth token scoped to A. \n\n(The PoC uses loopback servers; `allow_private_network=True` is only to avoid the separate SSRF guard blocking loopback and has no bearing on the leak.)\n\n### Impact\n\nExposure of sensitive information to an unauthorized actor (CWE-200). Affects operators who pass authentication headers/credentials to fetch a remote schema (`--http-headers`, `--url` with userinfo) when the configured host issues a redirect to a different origin \u2014 e.g. a compromised or open-redirect-prone schema host, or a redirect chain influenced by an attacker-supplied `$ref`. The leaked credential can then be replayed against the trusted host. This is a credential-scoping weakness secondary to, and in the same component as, the project\u0027s other SSRF hardening.\n\n### Suggested remediation\n\nWhen a redirect changes the origin (scheme/host/port), drop `Authorization` and other sensitive headers before following it, matching the behavior of mainstream HTTP clients.\n\n### Maintainer status\n\nConfirmed by maintainer review and regression tests. The private fix PR was merged and released in `0.63.0`: https://github.com/koxudaxi/datamodel-code-generator-ghsa-r5vv-ff45-prp2/pull/1\n\nFix summary: strip `Authorization`, `Cookie`, and `Proxy-Authorization` headers when a redirect crosses origin; preserve headers for same-origin redirects.\n\nRelease status: fixed in `0.63.0`; `0.62.0` and earlier are affected.\n\nValidation: `uv run --group test --extra http pytest tests/test_http.py` passed locally for the redirect regression coverage; `uv run --group fix ruff check src/datamodel_code_generator/http.py tests/test_http.py` passed.\n\nSubmitted by: Hamza Haroon (thegr1ffyn)",
  "id": "PYSEC-2026-3563",
  "modified": "2026-08-04T13:36:15.919253Z",
  "published": "2026-08-04T11:34:44.166317Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/koxudaxi/datamodel-code-generator/security/advisories/GHSA-r5vv-ff45-prp2"
    },
    {
      "type": "WEB",
      "url": "https://github.com/koxudaxi/datamodel-code-generator/commit/a585c037c8307b7aae815de193b7fe1c4c44994b"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/koxudaxi/datamodel-code-generator"
    },
    {
      "type": "WEB",
      "url": "https://github.com/koxudaxi/datamodel-code-generator/releases/tag/0.63.0"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/datamodel-code-generator"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-r5vv-ff45-prp2"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55403"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "datamodel-code-generator: Authorization / request headers leaked to cross-origin redirect target when fetching remote schemas"
}

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.

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-2026-55403 (GCVE-0-2026-55403)

FKIE_CVE-2026-55403

GHSA-R5VV-FF45-PRP2

Summary

Details

PoC

Impact

Suggested remediation

Maintainer status

OPENSUSE-SU-2026:11538-1

PYSEC-2026-3563

Summary

Details

PoC

Impact

Suggested remediation

Maintainer status

Tags

Sightings

Nomenclature

Related by attack behaviour