CVE-2024-58384: Jupyterlab · Tornado has a CRLF injection in CurlAsyncHTTPClient headers
Affects jupyterlabSource GCVE Database
Not known to be exploited · CVSS 6.3 Medium : upgrade to 4.2.3 when convenient.
Data as of 30 Oct 2026, 08:47 UTC
- Patch
- Available – fixed in 4.2.3
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:NExploitation evidence
Disclosed: evidence found.
CVE published 15 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
| Product | Affected | Fixed in |
|---|---|---|
Homebrewjupyterlabpkg:brew/jupyterlabOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A fix for this vulnerability is available in Tornado version 4.2.3. Users should upgrade to version 4.2.3 or later to remediate the issue. Until upgrading, avoid using CurlAsyncHTTPClient with untrusted header data or sanitize header values to remove CRLF characters before sending requests. No other vendor advisory mitigation instructions are provided.
Description
Tornado's CurlAsyncHTTPClient class in versions >=1.2.0 and <4.2.3 allows CRLF injection in HTTP request headers. This occurs because Tornado does not validate or reject carriage return and line feed characters in header values, enabling attackers to inject arbitrary headers or even additional HTTP requests. This vulnerability differs from the standard AsyncHTTPClient, which properly rejects such characters. The issue stems from libcurl and pycurl passing header strings verbatim without filtering control characters. Exploitation may facilitate server-side request forgery (SSRF) attacks. A fix is available in Tornado version 4.2.3.