Is CVE-2026-16266 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-16266?

CVE-2026-16266 has a CVSS v3 severity of MEDIUM (4).

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CVE-2026-16266

Description

Versions of the package mongo-object before 3.0.3 are vulnerable to Prototype Pollution via the expandKey() function in util.js. An attacker can modify the JavaScript prototype chain by supplying a crafted property path containing special keys such as __proto__.