Mongoose: Prototype pollution via Schema.prototype.virtual()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-125118
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-09 23:17:22 UTC
Updated2026-11-12 19:18:09 UTC
DescriptionMongoose 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.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

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

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

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
3.1CNADECLARED6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
Low

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
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

References

ReferenceSourceLinkTags
github.com/Automattic/mongoose/releases/tag/9.11.4 [email protected] github.com
github.com/Automattic/mongoose/commit/74df7769b5a8d89c4413b764029911ee91... [email protected] github.com
github.com/Automattic/mongoose/commit/7a2a6567abbb72c0430c8cc5b794214184... [email protected] github.com
github.com/Automattic/mongoose/releases/tag/8.24.7 [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-6972-9mcm-vhwj [email protected] github.com
github.com/Automattic/mongoose/commit/318f7e09dd363a1dfddb8180878488dccd... [email protected] github.com
github.com/Automattic/mongoose/commit/fb467e6d33174293dc0360649f20ce68d9... [email protected] github.com
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