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How a KV cache bug exposed other customers' prompts

This story is from 2026-11-05. It is preserved in the archive; the latest stories are on the live feed.

For about two weeks this summer, a small number of people using Cloudflare's GLM-5.3 model on Workers AI got answers stitched partly from someone else's prompt. Nobody stole a password. A memory bookkeeping mistake in the KV cache let 155 responses read pages a previous customer had left behind. Cl…

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  1. 2026-11-05 13:00 · DEV Community — AI
    How a KV cache bug exposed other customers' prompts

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