CVE-2026-16266 | Versions of the package mongo-object before 3.0.3 are vulner… | CVSS 4.0 MEDIUM

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__.

Metadata

CVE ID: CVE-2026-16266
State: PUBLISHED
Assigner: snyk
Reserved: 2026-07-20 08:55 UTC
Published: 2026-07-21 05:00 UTC
Last updated: 2026-07-21 05:00 UTC
Primary CWE: CWE-1321
Prototype Pollution
Vendor / Product: n/a / mongo-object
Sources: cve.org · NVD

Severity & Metrics

4.0 MEDIUM CVSS 3.1

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N

Affected products (1)

Vendor	Product	Platform	Versions
n/a	mongo-object	—	0 < 3.0.3

Weakness (CWE)

CWE	Source	Description
CWE-1321	cna	Prototype Pollution

CVSS scores (2)

Score	Severity	Version	Source	Vector
6.3	MEDIUM	4.0	cna	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N
4.0	MEDIUM	3.1	cna	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N

References (4)