Vulnerability 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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/theopaid/HTTP-Request-Smuggling-via-Unparsed-Transfer-Encodin
- https://www.vulncheck.com/advisories/tiny-http-http-request-smuggling-via-transf
- https://github.com/theopaid/HTTP-Request-Smuggling-via-Unparsed-Transfer-Encodin
FAQ
What is CVE-2026-66752?
CVE-2026-66752 is a vulnerability with a CVSS score of 5.4 (MEDIUM). 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 ...
How severe is CVE-2026-66752?
CVE-2026-66752 has been rated MEDIUM with a CVSS base score of 5.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-66752?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.