CVE-2026-66752: Tiny-HTTP

Medium severity, CVSS 5.4. EPSS: 0.3% chance of exploitation in the next 30 days.

tiny-http through 0.12.0 contains an HTTP request smuggling vulnerability that allows remote attackers to desynchronize request framing by sending a Transfer-Encoding header with any value, including non-chunked codings, which causes the library to unconditionally apply chunk-decoding and discard Content-Length. Attackers can exploit the discrepancy between tiny_http's improper Transfer-Encoding parsing and a correctly-implemented front-end proxy to produce two distinct interpretations of a single byte stream, enabling request smuggling, and can additionally send non-chunked bodies with non-chunked Transfer-Encoding values to cause failed body reads that tie up connections and consume worker threads without signaling errors to clients.

Affected products

• Tiny-HTTP Tiny-HTTP: up to and including 0.12.0

Published 2026-07-28. Last modified 2026-07-30.