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Vulnerabilities CVE-2026-66752

CVE-2026-66752

Medium
Open
TLP:CLEAR

tiny-http 0.12.0 HTTP Request Smuggling via Transfer-Encoding Handling

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Description

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.

Details

CVSS Score
6.3
EPSS Score
0.24%

14.8th percentile

CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:L/SA:L
Confidence
90%
Published
Jul 28, 2026
Last Modified
Jul 28, 2026
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