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VulnerabilityPublished

CVE-2024-14029: tornadoweb tornado · HTTP Request/Response Smuggling

Affects tornadoweb tornadoSource CVE Database V5

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Not known to be exploited · CVSS 9.0 Critical : upgrade to 6.4.1 as a priority.

Data as of 30 Oct 2026, 20:25 UTC

CVSS 4.0 base score
9.0Critical
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.3% chance of exploitation in 30 days – higher than 29% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 6.4.1
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

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 15 Sep 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Upgrade tornadoweb tornado to 6.4.1.

Affected software

ProductAffectedFixed in
tornadowebtornadoAffected
  • <6.4.1
Fixed in
  • 6.4.1
PyPItornadopkg:pypi/tornadoOther threatsAffected
  • <6.4.1
Fixed in
  • 6.4.1

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A fix is available in Tornado version 6.4.1. Users should upgrade to Tornado 6.4.1 or later to remediate this vulnerability. Until then, avoid deploying Tornado behind proxies that forward requests with multiple Transfer-Encoding headers or implement proxy-level mitigations to reject such malformed requests.

Description

CVE-2024-14029 is a critical HTTP request smuggling vulnerability in Tornado web server versions prior to 6.4.1. It occurs when Tornado receives HTTP requests containing two Transfer-Encoding: chunked headers, causing it to ignore both and misinterpret the request body. This behavior can lead to request smuggling attacks when Tornado is deployed behind proxies that forward such malformed requests, such as Pound. The vulnerability may allow attackers to bypass access controls, poison caches, or cause connection desynchronization.

References

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