Mem0's Auto Memory Resolver Can Silently Delete Valid User Preferences

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Mem0's memory management system uses an LLM-driven pipeline to automatically resolve conflicting facts by choosing between ADD, UPDATE, DELETE, or NONE operations on each stored memory. The conflict resolver works on text similarity alone, meaning it cannot distinguish between a user genuinely changing a preference and two valid preferences that apply in different contexts. When the system strips qualifying context from facts during extraction, two distinct preferences can appear contradictory, prompting a silent DELETE with no warning or exception raised. A developer discovered this flaw while running a long-lived agent, noticing only when the agent began behaving incorrectly due to a missing memory. The recommended fix involves making scope explicit in stored facts and adding an audit wrapper, rather than disabling the conflict resolver entirely.

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