Memory Mismanagement in MongoDB Due to Aggregation Queries

CVE-2026-4358

What is CVE-2026-4358?

A vulnerability exists in MongoDB where an authenticated user with write permissions can craft a specific aggregation query with $lookup, potentially leading to severe memory mismanagement issues within the slot-based execution engine. This can occur when an in-memory hash table is spilled to disk, causing unpredictable behavior in the system.

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References