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Cloudflare's KV Cache Exposure Leaked Other Customers' Prompts for Two Weeks

By Rohit Bhadani · DEV Community · 10/27/2026

For thirteen days between August 27 and September 9, 2026, some long prompts sent to Cloudflare's GLM-5.3 model on Workers AI came back with pieces of a different customer's conversation mixed in. Cloudflare disclosed the full root cause on October 26, 2026. The detail that stands out is how…

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