datamodel-code-generator vulnerable to arbitrary local file read via XSD schemaLocation (xs:include/xs:import) path traversal, with no remote-ref gate

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

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

EPSS

• CVE-2026-55390: 0.55% estimated exploitation activity in the next 30 days; percentile 46.11 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary When generating models from an XML Schema (--input-file-type xmlschema), datamodel-code-generator resolves <xs:include, <xs:import, <xs:redefine, and <xs:override schemaLocation attributes against the source directory and reads the target with no restriction to the input/base directory. An attacker who controls the input XSD can read arbitrary files via ../ traversal or an absolute path, and the included schema's contents (type names, restrictions, enumerations) are folded into the generated output. Unlike the JSON-Schema $ref path, there is no allowremoterefs control for XSD, so --no-allow-remote-refs does not mitigate it. This is an unauthenticated path-traversal / information-disclosure issue reachable in the default configuration. Details The XSD parser walks include-style children and reads each schemaLocation with only an isfile() check (src/datamodelcodegenerator/parser/xmlschema.py): schemalocation is attacker-controlled and readxmltext does path.readbytes(). Because…

Published by the source

28 Jul 2026, 21:26 UTC

Last modified by the source

28 Jul 2026, 21:26 UTC

Source last checked

26 Oct 2026, 13:50 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-442q-2j6p-642g

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# Patch Next advisory brief: CVE-2026-55390

Advisory: datamodel-code-generator vulnerable to arbitrary local file read via XSD `schemaLocation` (`xs:include`/`xs:import`) path traversal, with no remote-ref gate
IDs: CVE-2026-55390, GHSA-442q-2j6p-642g
Record: https://patchnext.com/advisories/cve-2026-55390 (revision 1, source checked 26 Oct 2026, 13:50 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: datamodel-code-generator 0.62.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI datamodel-code-generator: affected >= 0.59.0, <= 0.61.0; fixed in 0.62.0

## Suggested inspection (read-only)
- `python -m pip show datamodel-code-generator`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on datamodel-code-generator.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-442q-2j6p-642g (GitHub-reviewed advisory GHSA-442q-2j6p-642g lists affected ranges: PyPI datamodel-code-generator >=0.59.0 <=0.61.0)

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