Automattic Mongoose up to 6.13.11/7.8.12/8.24.6/9.11.3 Virtual Schema.prototype.virtual prototype pollution

Summaryinfo

A vulnerability labeled as critical has been found in Automattic Mongoose up to 6.13.11/7.8.12/8.24.6/9.11.3. This vulnerability affects the function Schema.prototype.virtual of the component Virtual. Such manipulation leads to prototype pollution. This vulnerability is documented as CVE-2026-125118. The attack can be executed remotely. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Automattic Mongoose up to 6.13.11/7.8.12/8.24.6/9.11.3 and classified as critical. Affected by this issue is the function Schema.prototype.virtual of the component Virtual. The manipulation 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 6.13.12, 7.8.13, 8.24.7, and 9.11.4, Schema.prototype.virtual() builds nested virtual paths without applying the special-property validation already used by Schema.path() and Schema.add(). An attacker who can influence virtual field names in dynamic schemas, content-management form builders, or schema-as-code systems can supply path segments such as __proto__, constructor, or prototype, causing the virtual-path reducer to write enumerable properties to Object.prototype or Function.prototype. The resulting prototype pollution can spoof inherited property checks such as authorization flags and can provide function-prototype gadget state to other server-side JavaScript code. This issue is fixed in versions 6.13.12, 7.8.13, 8.24.7, and 9.11.4.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-125118 since 11/09/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.

Upgrading to version 6.13.12, 7.8.13, 8.24.7 or 9.11.4 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
• 6.13.10
• 6.13.11
• 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
• 7.8.10
• 7.8.11
• 7.8.12
• 8.24.0
• 8.24.1
• 8.24.2
• 8.24.3
• 8.24.4
• 8.24.5
• 8.24.6
• 9.11.0
• 9.11.1
• 9.11.2
• 9.11.3

Website

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

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