CVE-2024-14029

High

Description

Tornado before 6.4.1 ignores duplicate Transfer-Encoding: chunked headers, treating requests as having no message body and parsing the chunked body as a subsequent request. Attackers can exploit this inconsistency when Tornado is deployed behind proxies to perform HTTP request smuggling, enabling access control bypass, cache poisoning, or connection desynchronization.

SeverityHigh

CVSS7.5

Exploit probability—

ProductTornado

PublishedSep 15, 2026

First seenSep 15, 2026

Weakness typeCWE-444CWE-444

How to fix

Update

tornado6.4.1 or later

Vendor advisories

github.com/tornadoweb/tornado/security/advisories/GHSA-753j-mpmx-qq6g

Affected products

Product	Affected versions	Fixed in
tornadoPyPI	v < 6.4.1	6.4.1

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