Automattic Mongoose up to 6.13.9/7.8.9/8.24.0/9.7.1 Update Casting body prototype pollution

Summaryinfo

A vulnerability classified as critical was found in Automattic Mongoose up to 6.13.9/7.8.9/8.24.0/9.7.1. This affects the function Schema.prototype.path/Schema.prototype._getPathType of the component Update Casting. Such manipulation of the argument body leads to prototype pollution. This vulnerability is uniquely identified as CVE-2026-73562. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Automattic Mongoose up to 6.13.9/7.8.9/8.24.0/9.7.1 and classified as critical. Affected by this issue is the function Schema.prototype.path/Schema.prototype._getPathType of the component Update Casting. The manipulation of the argument body with an unknown input leads to a prototype pollution vulnerability. Using CWE to declare the problem leads to CWE-1321. The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Mongoose is a MongoDB object modeling tool designed to work in an asynchronous environment. Prior to 6.13.10, 7.8.10, 8.24.1, and 9.7.2, passing a user-controlled update such as MyModel.updateOne(filter, req.body) can exploit Mongoose update casting with a __proto__.x dotted path under $set. Schema.prototype.path and Schema.prototype._getPathType can treat inherited properties of schema.paths and schema.nested as schema types, allowing the casting process to set $fullPath and $parentSchemaDocArray on Object.prototype before throwing. This prototype pollution makes those properties visible on newly created objects and can cause application integrity and availability impacts. This issue is fixed in versions 6.13.10, 7.8.10, 8.24.1, and 9.7.2.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-73562 since 08/12/2026. The exploitation is known to be easy. The attack may be launched remotely. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.

Upgrading to version 6.13.10, 7.8.10, 8.24.1 or 9.7.2 eliminates this vulnerability.

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Productinfo

Vendor

• Automattic

Name

• Mongoose

Version

• 6.13.0
• 6.13.1
• 6.13.2
• 6.13.3
• 6.13.4
• 6.13.5
• 6.13.6
• 6.13.7
• 6.13.8
• 6.13.9
• 7.8.0
• 7.8.1
• 7.8.2
• 7.8.3
• 7.8.4
• 7.8.5
• 7.8.6
• 7.8.7
• 7.8.8
• 7.8.9
• 8.0
• 8.1
• 8.2
• 8.3
• 8.4
• 8.5
• 8.6
• 8.7
• 8.8
• 8.9
• 8.10
• 8.11
• 8.12
• 8.13
• 8.14
• 8.15
• 8.16
• 8.17
• 8.18
• 8.19
• 8.20
• 8.21
• 8.22
• 8.23
• 8.24.0
• 9.7.0
• 9.7.1

Website

• Product: https://github.com/Automattic/mongoose/

CPE 2.3info

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CPE 2.2info

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