Common Mem0 Bug Leaks One User's Memories Into Another's Session

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A widespread integration error in Mem0-powered AI agents causes user memories to bleed across sessions when the search() function is called without proper identity filters. Developers typically scope memory writes with a user_id but neglect to apply the same filter on read queries, allowing the vector store to return semantically similar results from any user. The bug passes undetected in single-user development environments and only surfaces once multiple real users interact concurrently. Mem0 supports three identity dimensions — user_id, agent_id, and run_id — and failing to apply all relevant filters consistently on both add() and search() calls can expose the wrong memories to the wrong agent or session. The fix requires matching every search() call with the same scoping identifiers used during the original memory write.

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