BIT-MONGODB-2026-13055 Server crash via aggregation pipeline expression with compound wildcard index specification

The $internalIndexKey aggregation expression can be used by any authenticated user to crash a MongoDB server mongod. The expression fails to handle compound wildcard index specifications, triggering an internal consistency check that aborts the server process. The user must be able to run an...

CVE-2026-25613 An unsafe cast in the MongoDB query planner can result in a segmentation fault.

An authorized user may disable the MongoDB server by issuing a query against a collection that contains an invalid compound wildcard index...

Post-auth queries on compound index may crash mongod

A user authorized to perform database queries may trigger denial of service by issuing specially crafted queries with compound indexes affecting QueryPlanner. This issue affects: MongoDB Inc. MongoDB Server v3.6 versions prior to 3.6.9, v4.0 versions prior to 4.0.3...

CVE-2018-20802 Post-auth queries on compound index may crash mongod

A user authorized to perform database queries may trigger denial of service by issuing specially crafted queries with compound indexes affecting QueryPlanner. This issue affects MongoDB Server v3.6 versions prior to 3.6.9 and MongoDB Server v4.0 versions prior to 4.0.3...