IM
IronMonkey Threat Research

CVE-2026-16266 MEDIUM

Published: 2026-07-21 | Last Modified: 2026-07-21 | Status: Received

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__.

CVSS Metrics

Base Score: 4.0 (MEDIUM)

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

Attack VectorNETWORK
Attack ComplexityHIGH
Privileges RequiredNONE
User InteractionNONE
ScopeCHANGED
Confidentiality ImpactNONE
Integrity ImpactLOW
Availability ImpactNONE

Source: [email protected]

Type: Secondary

Exploitability Score: 2.2

Impact Score: 1.4

Base Score: 6.3 (MEDIUM)

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack VectorNETWORK
Attack ComplexityLOW
Attack RequirementsPRESENT
Privileges RequiredNONE
User InteractionNONE
Vulnerability ConfidentialityNONE
Vulnerability IntegrityLOW
Vulnerability AvailabilityNONE
Subsequent ConfidentialityNONE
Subsequent IntegrityLOW
Subsequent AvailabilityNONE

Source: [email protected]

Type: Secondary

Weaknesses

Source Type Description
[email protected] Secondary
en CWE-1321
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