Developer Finds Vote-Spoofing Bug in Open-Source AI Memory SDK, Fix Shipped in Days

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A developer auditing MemWal, an open-source AI-memory SDK by MystenLabs, discovered a logic flaw in a sample chatbot app built on the platform. The bug allowed any user who could view a message in a public chat to cast a vote on another user's message by exploiting a mismatch between the vote-existence check and the actual update query. The existence check queried only by message ID, while the UPDATE required both message ID and chat ID, meaning a spoofed vote would silently block the original owner from ever voting. Critically, the system returned a 200 success response with no errors or logs, leaving the feature permanently broken for the legitimate user. The developer reported the issue responsibly, and the maintainers confirmed and released a fix within days.

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