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CVE-2026-66752 is an HTTP request smuggling vulnerability in tiny-http through version 0.12.0. The flaw stems from improper parsing of the Transfer-Encoding header: the library treats the presence of Transfer-Encoding as sufficient to trigger chunked decoding and to ignore Content-Length, even when the header value is not chunked and may contain any other coding. This creates a parsing discrepancy between tiny-http and a correctly implemented front-end proxy that follows HTTP framing rules more strictly. An attacker can craft a single byte stream that the proxy and the backend interpret differently, causing request boundary desynchronization and enabling smuggled requests to be processed by the backend. The same flawed handling also allows non-chunked bodies paired with non-chunked Transfer-Encoding values to trigger failed body reads that keep connections occupied and consume worker threads without surfacing errors to clients.
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