NocoDB has Prototype Pollution in Connection Test Endpoint, Leading to DoS
Summary
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.
Impact
Pollutes Object.prototype globally, breaking all subsequent database write operations for all users until process restart.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | nocodb | < 0.301.0 | 0.301.0 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H- Weakness (CWE)
CWE-1321- Platform
- npm
- Package
nocodb- Disclosed
- 28.01.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-95ff-46g6-6gw9 - CC BY 4.0
Vulnerability history: nocodb
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 54
- First → latest
- 06.2022 06.2026
- Without a fix
- 13
- Exploited in attacks
- 0
Severity breakdown
- High 7
- Medium 41
- Low 6
Disclosures per year
- 2022: 5
- 2023: 2
- 2024: 3
- 2025: 1
- 2026: 43
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NocoDB has Prototype Pollution in Connection Test Endpoint, Leading to DoS this entry
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