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__.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact Low

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Changed

Confidentiality Impact None

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00247.

Exploitation poc

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
n/a mongo-object affected
Version Status Constraints
0 affected < 3.0.3

No data.

No data.

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Vendors Products
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Mongo-object Subscribe

Project Subscriptions

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Mongo-object Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/longshotlabs/mongo-object/blob/4f7a570f2a2fcfa9417b7870d5f859e9574ec73c/src/util.ts%23L251 cve-icon
https://github.com/longshotlabs/mongo-object/commit/638314107d8b397e5453c28e41729522b3e8d67c cve-icon
https://github.com/longshotlabs/mongo-object/issues/27 cve-icon cve-icon
https://security.snyk.io/vuln/SNYK-JS-MONGOOBJECT-13816714 cve-icon
History

Wed, 05 Aug 2026 10:45:00 +0000

Type Values Removed Values Added
First Time appeared Longshotlabs
Longshotlabs mongo-object
Vendors & Products Longshotlabs
Longshotlabs mongo-object

Thu, 30 Jul 2026 18:30:00 +0000

Type Values Removed Values Added
Title Prototype Pollution via expandKey in mongo-object

Wed, 29 Jul 2026 00:45:00 +0000

Type Values Removed Values Added
Title Prototype Pollution via expandKey in mongo-object Package

Fri, 24 Jul 2026 22:30:00 +0000

Type Values Removed Values Added
Title Prototype Pollution via expandKey in mongo-object Package

Tue, 21 Jul 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Tue, 21 Jul 2026 05:45:00 +0000

Type Values Removed Values Added
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__.
Weaknesses CWE-1321
References
Metrics cvssV3_1

{'score': 4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N'}

cvssV4_0

{'score': 6.3, 'vector': '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: snyk

Published:

Updated: 2026-07-21T14:52:06.858Z

Reserved: 2026-07-20T08:55:21.686Z

Link: CVE-2026-16266

cve-icon Vulnrichment

Updated: 2026-07-21T14:35:34.964Z

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-05T10:22:39Z

Weaknesses