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Vulnerability record · CVE-2024-14029 · published 15 September 2026

CVE-2024-14029: HTTP request smuggling vulnerability

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.

9.0 CVSS 4.0 Critical EPSS 0.35% · top 73.7% CWE-444 · HTTP request smuggling Deferred
9.0CVSS 4.0 base score
0.35%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
28 Sep 2026Last modified by NVD

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.

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:L/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/tornadoweb/tornado/security/advisories/GHSA-753j-mpmx-qq6g
https://www.vulncheck.com/advisories/tornado-before-6.4.1-http-request-smuggling-via-transfer-encoding
https://github.com/tornadoweb/tornado/security/advisories/GHSA-753j-mpmx-qq6g

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Source: NIST National Vulnerability Database (record CVE-2024-14029), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.