Mongoose walks into inherited properties when hydrating, setting, and merging, allowing overwrites of built-in functions (denial of service) and shared schema state

Summary

CVE	CVE-2026-125117
State	PUBLISHED
Assigner	GitHub_M
Source Priority	CVE Program / NVD first with legacy fallback
Published	2026-11-09 23:17:22 UTC
Updated	2026-11-10 17:17:26 UTC
Description	Mongoose is a MongoDB object modeling tool designed to work in an asynchronous environment. Prior to 6.13.12, 7.8.13, 8.24.7, and 9.11.4, Mongoose can descend into inherited properties while loading database documents in init(), setting dotted paths in $__set, and merging update documents in utils.mergeClone. Attacker-controlled keys such as toString or valueOf can therefore cause Mongoose to write into shared built-in functions instead of an own property. A crafted document, Mixed path, non-strict document or subdocument, findOneAndReplace() replacement, chained update, or Query.prototype.merge() source can overwrite Object.prototype.toString.call, causing later queries on unrelated models to fail until the process restarts. Separately, when an attacker controls the dotted path passed to doc.set(path, value) for a subdocument configured with strict: false, descent through $__set can reach $__schema and alter shared validators or schema options for later documents. Mongoose already blocks __proto__, constructor, and prototype, so this issue overwrites properties on reachable shared objects rather than adding new properties directly to Object.prototype. This issue is fixed in versions 6.13.12, 7.8.13, 8.24.7, and 9.11.4.

Primary CVSS: v3.1 8.2 HIGH from [email protected]

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

Problem Types: CWE-1321 | CWE-1321 CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

Version	Source	Type	Score	Severity	Vector
3.1	[email protected]	Secondary	8.2	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H`
3.1	CNA	DECLARED	8.2	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H`

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

High

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

Source	Vendor	Product	Version	Platforms
CNA	Automattic	Mongoose	affected < 6.13.12	Not specified
CNA	Automattic	Mongoose	affected >= 7.0.0, < 7.8.13	Not specified
CNA	Automattic	Mongoose	affected >= 8.0.0, < 8.24.7	Not specified
CNA	Automattic	Mongoose	affected >= 9.0.0, < 9.11.4	Not specified

Reference	Source	Link	Tags
github.com/Automattic/mongoose/commit/2a195d19a4dd240f039a0a226614d5804e...	[email protected]	github.com
github.com/Automattic/mongoose/releases/tag/9.11.4	[email protected]	github.com
github.com/Automattic/mongoose/commit/18b5513dd463731a2caf0d3395ef1d9eb0...	[email protected]	github.com
github.com/Automattic/mongoose/commit/3cb702b8d079c3e267f0b10f41673a1590...	[email protected]	github.com
github.com/Automattic/mongoose/releases/tag/8.24.7	[email protected]	github.com
github.com/Automattic/mongoose/commit/8eb74cb4a550cbe0225963b07aebacbd99...	[email protected]	github.com
github.com/Automattic/mongoose/releases/tag/7.8.13	[email protected]	github.com
github.com/Automattic/mongoose/releases/tag/6.13.12	[email protected]	github.com
github.com/Automattic/mongoose/security/advisories/GHSA-8332-j7wj-wjw4	134c704f-9b21-4f2e-91b3-4a467353bcc0	github.com
github.com/Automattic/mongoose/commit/8cee51beead554df1f3d05645edb439c69...	[email protected]	github.com
github.com/Automattic/mongoose/commit/85cf897105edfeb5f56be42a18a6870443...	[email protected]	github.com
CVE Program record	CVE.ORG	www.cve.org	canonical
NVD vulnerability detail	NVD	nvd.nist.gov	canonical, analysis

No vendor comments have been submitted for this CVE.

There are currently no legacy QID mappings associated with this CVE.