CVE-2026-33863

CVE-2026-33863 · Convict has prototype pollution via load(), loadFile(), and schema initialization

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### Impact Two unguarded prototype pollution paths exist, not covered by previous fixes: 1. `config.load()` / `config.loadFile()` — `overlay()` recursively merges config data without checking for forbidden keys. Input containing` __proto__` or `constructor.prototype` (e.g. from a JSON file) causes the recursion to reach `Object.prototype` and write attacker-controlled values onto it. 2. Schema initialization — passing a schema with `constructor.prototype.*` keys to `convict({...})` causes default-value propagation to write directly to `Object.prototype` at startup. Depending on how polluted properties are consumed, impact ranges from unexpected behavior to authentication bypass or RCE. ### Workarounds Do not pass untrusted data to load(), loadFile(), or convict(). ### Resources Prior advisory: [GHSA-44fc-8fm5-q62h](https://github.com/mozilla/node-convict/security/advisories/GHSA-44fc-8fm5-q62h) Related issue: [https://github.com/mozilla/node-convict/issues/423](https://github.com/mozilla/node-convict/issues/423)

CVSS 9.4 · Critique · Correctif disponible

Publication

2026-03-26T18:50:33Z

Mise à jour

2026-03-26T19:11:25.577317Z

Pile logicielle: node

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