CVE-2026-24766

An authenticated user with org-level-creator permissions can exploit prototype pollution in the /api/v2/meta/connection/test endpoint, causing all database write operations to fail application-wide until server restart.

While the pollution technically bypasses SUPER_ADMIN authorization checks, no practical privileged actions can be performed because database operations fail immediately after pollution.

Details

The deepMerge() function in packages/nocodb/src/utils/dataUtils.ts does not sanitize the following keys: (__proto__, constructor, prototype):

export const deepMerge = (target: any, ...sources: any[]) => {
  // ...
  Object.keys(source).forEach((key) => {
    if (isMergeableObject(source[key])) {
      if (!target[key]) target[key] = Array.isArray(source[key]) ? [] : {};
      deepMerge(target[key], source[key]);  // Recursively merges __proto__
    } else {
      target[key] = source[key];
    }
  });
  // ...
};

The testConnection endpoint (packages/nocodb/src/controllers/utils.controller.ts) passes user-controlled input directly to deepMerge():

config = await integration.getConfig();
deepMerge(config, body);

When an attacker sends {"__proto__": {"super": true}}, the super property is written to Object.prototype, affecting all plain objects in the Node.js process.

Pollutes Object.prototype globally, breaking all subsequent database write operations for all users until process restart.

CVE-2026-24766 has a CVSS score of 4.9 (Medium). The vector is network-reachable, high 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 (0.301.0); upgrading removes the vulnerable code path.

Kodem intelligence

1. What is CVE-2026-24766? CVE-2026-24766 is a medium-severity security vulnerability in nocodb (npm), affecting versions < 0.301.0. It is fixed in 0.301.0.
2. How severe is CVE-2026-24766? CVE-2026-24766 has a CVSS score of 4.9 (Medium). 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 nocodb are affected by CVE-2026-24766? nocodb (npm) versions < 0.301.0 is affected.
4. Is there a fix for CVE-2026-24766? Yes. CVE-2026-24766 is fixed in 0.301.0. Upgrade to this version or later.
5. Is CVE-2026-24766 exploitable, and should I be worried? Whether CVE-2026-24766 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-2026-24766 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-2026-24766? Upgrade nocodb to 0.301.0 or later.