CVE-2023-23619

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

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);

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

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

Untrusted input is evaluated as executable code within the application's runtime environment. Typical impact: arbitrary code execution within the application's privilege context.

CVE-2023-23619 has a CVSS score of 9.9 (Critical). The vector is network-reachable, low privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (1.0.0); upgrading removes the vulnerable code path.

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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.

1. What is CVE-2023-23619? CVE-2023-23619 is a critical-severity code injection vulnerability in @asyncapi/modelina (npm), affecting versions < 1.0.0. It is fixed in 1.0.0. Untrusted input is evaluated as executable code within the application's runtime environment.
2. How severe is CVE-2023-23619? CVE-2023-23619 has a CVSS score of 9.9 (Critical). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which versions of @asyncapi/modelina are affected by CVE-2023-23619? @asyncapi/modelina (npm) versions < 1.0.0 is affected.
4. Is there a fix for CVE-2023-23619? Yes. CVE-2023-23619 is fixed in 1.0.0. Upgrade to this version or later.
5. Is CVE-2023-23619 exploitable, and should I be worried? Whether CVE-2023-23619 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether CVE-2023-23619 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
7. How do I fix CVE-2023-23619? Upgrade @asyncapi/modelina to 1.0.0 or later.