CVE-2026-127208

datamodel-code-generator < 0.84.0 Code Injection via x-python-type Annotation

8.6 high

High (8.6) in datamodel-code-generator datamodel-code-generator.

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Severity
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Affected
Versions
Attack patterns (CAPEC)
History
References
Your exposure

datamodel-code-generator before 0.84.0 contains a code injection vulnerability that allows attackers to achieve arbitrary code execution by supplying a malicious JSON Schema with a crafted x-python-type annotation containing a string ast.Constant node in a subscript slice position, which bypasses validation in parse_python_type_annotation and _python_type_expr_from_ast. Attackers can embed malicious Python expressions such as __import__ calls within quoted string literals in the generated source code, which Pydantic v2 evaluates as a ForwardRef via eval() during model_rebuild(), resulting in arbitrary code execution on developer workstations, CI/CD pipelines, or applications that generate and import the produced models at runtime.

Severity

CVSS 4.0

8.6 high

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS 3.1

8.8 high

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

CWE: CWE-94 Improper Control of Generation of Code (Code Injection)
OWASP Top 10: A05:2025 Injection
Published: 2026-11-12 21:17 UTC
Modified: 2026-11-12 21:17 UTC
Assigned by: VulnCheck (CNA)
NVD analysis: Deferred: the NVD does not plan to analyze it
Record from: the NVD, synced 2026-11-12 21:43 UTC

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Affected

datamodel-code-generator:datamodel-code-generator

Versions

From the CNA's record in the CVE List.

Product	Affected
datamodel-code-generator	before 0.84.0

Attack patterns (CAPEC)

CAPEC-35 Leverage Executable Code in Non-Executable Files Likelihood: High · Severity: Very High
CAPEC-77 Manipulating User-Controlled Variables Likelihood: High · Severity: Very High
CAPEC-242 Code Injection Likelihood: High · Severity: High

The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits.

History

2026-11-12 The NVD deferred its analysis

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References

Check your stack JSON