CVE-2024-52804
Tornado has HTTP cookie parsing DoS vulnerability
At a glance
- Severity
- HIGH 7.5
- EPSS
- EPSS 1.04 % · percentile 64 (2026-10-27)
- State
- PUBLISHED
- Published
- Updated
- Assigner
- GitHub_M
- NVD status
- Modified
Description
Tornado is a Python web framework and asynchronous networking library. The algorithm used for parsing HTTP cookies in Tornado versions prior to 6.4.2 sometimes has quadratic complexity, leading to excessive CPU consumption when parsing maliciously-crafted cookie headers. This parsing occurs in the event loop thread and may block the processing of other requests. Version 6.4.2 fixes the issue.
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | GitHub_M |
| CVSS 3.1 | HIGH 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | NVD · security-advisories@github.com (Secondary) |
Weaknesses (CWE)
Advisories
- GHSA-8w49-h785-mj3c — Tornado has an HTTP cookie parsing DoS vulnerability
- PYSEC-2026-1975 — Tornado has an HTTP cookie parsing DoS vulnerability
European references
- ENISA EUVD · EUVD-2024-3349
- GCVE · GCVE-0-2024-52804
CERT-FR advisories
- CERTFR-2026-AVI-1165 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0901 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0563 — Multiples vulnérabilités dans les produits Splunk · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0303 — Multiples vulnérabilités dans les produits Splunk · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:a:tornadoweb:tornado:*:*:*:*:*:*:*:*< 6.4.2
Affected products
| Product | Versions |
|---|---|
| tornadoweb · tornado | affected < 6.4.2 |
References
- https://github.com/tornadoweb/tornado/security/advisories/GHSA-8w49-h785-mj3c
- https://github.com/tornadoweb/tornado/commit/d5ba4a1695fbf7c6a3e54313262639b198291533
- https://github.com/advisories/GHSA-7pwv-g7hj-39pr
- https://lists.debian.org/debian-lts-announce/2025/01/msg00000.html
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |