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VulnerabilityPublished Updated

CVE-2024-14029: Jupyterlab · Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') in tornado

Affects jupyterlabSource GCVE Database

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Authoritative record:CVE-2024-14029· Critical 9.0

Not known to be exploited · CVSS 9.0 Critical : upgrade to 4.2.3 as a priority.

Data as of 30 Oct 2026, 08:47 UTC

CVSS 4.0 base score
9.0Critical
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 4.2.3
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 29 Oct 2026.

What to do

Upgrade jupyterlab to 4.2.3.

Affected software

ProductAffectedFixed in
Homebrewjupyterlabpkg:brew/jupyterlabOther threatsAffected
  • >=1.2.0 <4.2.3
Fixed in
  • 4.2.3

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

AI-suggested

A patch is available and fixed in Tornado version 4.2.3. Users should upgrade to Tornado 4.2.3 or later to remediate this vulnerability. No additional mitigation is required if the patch is applied.

Description

CVE-2024-14029 is a vulnerability in Tornado used by JupyterLab where the server inconsistently handles HTTP requests containing multiple Transfer-Encoding: chunked headers. This flaw enables HTTP request smuggling when Tornado is deployed behind proxies that forward such malformed requests. The issue is fixed in Tornado version 4.2.3.

References

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