CVE-2024-52804

Tornado has an HTTP cookie parsing DoS vulnerability

Description

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.

See also CVE-2024-7592 for a similar vulnerability in cpython.

Patch Available

Fix available through Seal Security.  
No upgrade required, protect your application instantly.

Fix without upgrading

Score

7.5

Severity

High

Ecosystem

Python

Publish Date

November 22, 2024

Modified Date

February 3, 2026

Score Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Versions