Bug 2570206 (CVE-2026-125118)

Summary: CVE-2026-125118 mongoose: Mongoose: Security bypass via prototype pollution in virtual schema paths
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Mongoose. When defining nested virtual paths in database schemas, the software fails to properly sanitize special object property names. A remote attacker who can influence schema field definitions—such as through dynamic form builders—can supply crafted property names to inject attributes into base JavaScript objects (prototype pollution). This unauthorized modification can allow an attacker to bypass authorization controls or disrupt application functionality.
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Bug Depends On: 2571528, 2571530, 2571527, 2571529    
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Description OSIDB Bzimport 2026-11-10 19:43:10 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, 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.