Bug 2570605 (CVE-2026-125116)

Summary: CVE-2026-125116 mongoose: Mongoose: Denial of Service via discriminator key type confusion
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in Mongoose. A remote attacker can supply crafted document discriminator values—such as inherited object property names—to trigger type confusion during object modeling operations. This flaw allows an attacker to cause a persistent Denial of Service (DoS) by storing records that cause subsequent database queries to fail, or to bypass schema validation and field filtering.
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Bug Depends On: 2571519, 2571521, 2571520, 2571522    
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Description OSIDB Bzimport 2026-11-10 20:10:00 UTC 
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 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.