Vulnerability · Published Oct 6, 2026 · Assigned by certcc
CVE-2026-106550CVE-2026-106550
High 7.5
In plain English
A high-severity prototype pollution in Node-convict from Mozilla. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities).
Official description
Mozilla's Node-convict (version 6.2.2 and later) is vulnerable to a Denial of Service vulnerability caused by incomplete prototype‑pollution protections in config.set(). An attacker controlling the configuration key can write arbitrary properties to constructor.<key>, which walk() resolves to the global Object function. This allows overwriting core JavaScript methods such as Object.assign, leading to persistent process-wide failures and requiring a restart. The issue bypasses existing filters that only block constructor.prototype.* and __proto__.*. Exploitation requires an endpoint that forwards attacker-controlled keys into config.set().
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Node-convict | 6.2.2 |
Weakness: CWE-1321, CWE-915, CWE-400 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H