{"cve":"CVE-2024-52804","nvd":{"published":"2024-11-22T16:15:34.417","modified":"2026-06-17T08:07:39.533","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-400","CWE-770"],"references":["https://github.com/advisories/GHSA-7pwv-g7hj-39pr","https://github.com/tornadoweb/tornado/commit/d5ba4a1695fbf7c6a3e54313262639b198291533","https://github.com/tornadoweb/tornado/security/advisories/GHSA-8w49-h785-mj3c","https://lists.debian.org/debian-lts-announce/2025/01/msg00000.html"],"products":["tornadoweb:tornado"],"source":"nvd","synced_at":"2026-10-19T21:57:34.731061660+00:00"},"epss":{"cve":"CVE-2024-52804","score":0.01044,"percentile":0.64155,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-8w49-h785-mj3c","url":"https://osv.dev/vulnerability/GHSA-8w49-h785-mj3c","summary":"Tornado has an HTTP cookie parsing DoS vulnerability","modified":"2026-09-10T03:50:20.413166306Z","packages":[{"ecosystem":"PyPI","name":"tornado","purl":"pkg:pypi/tornado","ranges":["<6.4.2"],"fixed":["6.4.2"]}]},{"id":"PYSEC-2026-1975","url":"https://osv.dev/vulnerability/PYSEC-2026-1975","summary":"Tornado has an HTTP cookie parsing DoS vulnerability","modified":"2026-07-07T17:48:11.506068720Z","packages":[{"ecosystem":"PyPI","name":"tornado","purl":"pkg:pypi/tornado","ranges":["<6.4.2"],"fixed":["6.4.2"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}