{"id":"CVE-2024-52804","aliases":["GHSA-8w49-h785-mj3c","PYSEC-2026-1975"],"title":"Tornado has an HTTP cookie parsing DoS vulnerability","summary":"Tornado has an HTTP cookie parsing DoS vulnerability","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","vendor":"tornado","product":"tornado","ecosystem":"pip","affected":["tornado < 6.4.2"],"patched":["tornado 6.4.2"],"published":"2024-11-22","updated":"2026-09-10","sourceUpdated":"2026-09-10T03:50:20.413166306Z","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-8w49-h785-mj3c","references":[{"url":"https://github.com/tornadoweb/tornado/security/advisories/GHSA-8w49-h785-mj3c"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-52804"},{"url":"https://github.com/tornadoweb/tornado/commit/d5ba4a1695fbf7c6a3e54313262639b198291533"},{"url":"https://github.com/tornadoweb/tornado"},{"url":"https://lists.debian.org/debian-lts-announce/2025/01/msg00000.html"}],"tags":["osv","pip"],"epss":0.01044,"epssPercentile":0.62132,"ingestedAt":"2026-07-08T18:25:47.559Z","slug":"CVE-2024-52804","body":"## Overview\n\nThe 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.\n\nSee also CVE-2024-7592 for a similar vulnerability in cpython.\n\n## Affected packages\n\n- `tornado < 6.4.2`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `tornado 6.4.2`","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[]}