Mongoose: Discriminator key values matching inherited properties (e.g. __t: 'constructor') bypass schema casting and can poison collections

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-125116
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-09 23:17:21 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, Mongoose uses attacker-controlled discriminator key values, including the default __t field, to index plain-object registries such as Model.discriminators and schema.discriminators without requiring an own property. Values such as constructor, toString, or hasOwnProperty can therefore resolve to inherited built-in functions instead of a registered discriminator, causing type confusion in model construction, document creation, hydration, query and update casting, embedded discriminators, and populate operations. In the bulkWrite() insertOne path with skipValidation enabled, a constructor value can cause a raw input object to be stored without schema casting or strict filtering, and a stored poisoned document can make every query that hydrates it fail until the document is removed. The weakness reads inherited properties but does not modify Object.prototype and is not prototype pollution. 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 4.8 MEDIUM from [email protected]

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

Problem Types: CWE-843 | CWE-843 CWE-843: Access of Resource Using Incompatible Type ('Type Confusion')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.8MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L
3.1CNADECLARED4.8MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:N/AC:H/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/security/advisories/GHSA-wr5m-5jph-8m96 [email protected] github.com
github.com/Automattic/mongoose/commit/390453c8ce1b36b6cfd1e63432a910da1f... [email protected] github.com
github.com/Automattic/mongoose/commit/b68f90734b50cd22c89a669c8ca1469d72... [email protected] github.com
github.com/Automattic/mongoose/releases/tag/8.24.7 [email protected] github.com
github.com/Automattic/mongoose/commit/0ecd8040d9b446f36535d79938c130c800... [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/commit/b26c43554233134ea978c5852babe13be8... [email protected] github.com
github.com/Automattic/mongoose/commit/18afab75bea861f625b7c5b54635c84567... [email protected] github.com
github.com/Automattic/mongoose/commit/8cee51beead554df1f3d05645edb439c69... [email protected] github.com
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