---
id: CVE-2024-14029
title: >-
  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
summary: >-
  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
  deploye…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:N'
cwe:
  - CWE-444
vendor: tornadoweb
product: tornado
affected:
  - tornado < 6.4.1
published: '2026-09-15'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T13:42:48.607'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2024-14029'
references:
  - url: >-
      https://github.com/tornadoweb/tornado/security/advisories/GHSA-753j-mpmx-qq6g
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/tornado-before-6.4.1-http-request-smuggling-via-transfer-encoding
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/tornadoweb/tornado/security/advisories/GHSA-753j-mpmx-qq6g
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: >-
      https://github.com/tornadoweb/tornado/commit/d65f6e71a77f53a1ff0a0dc55704be13f04eb572
  - url: 'https://github.com/tornadoweb/tornado'
tags:
  - nvd
  - cve.org
  - exploit-available
  - osv
  - pip
  - score-dispute
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-15T17:07:58.664131Z'
ingestedAt: '2026-09-15T15:39:12.928Z'
aliases:
  - GHSA-753j-mpmx-qq6g
ecosystem: pip
patched:
  - tornado 6.4.1
scores:
  nvd: 7.5
  osv: 5.3
epss: 0.00352
epssPercentile: 0.26047
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2024-14029)

Affected packages:

- `tornado < 6.4.1`

Patched in:

- `tornado 6.4.1`

Source: https://osv.dev/vulnerability/GHSA-753j-mpmx-qq6g