Excessive Iteration Affecting tornado package, versions [,6.5.3)
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Test your applications- Snyk IDSNYK-PYTHON-TORNADO-14400979
- published12 Dec 2025
- disclosed12 Dec 2025
- creditFinder16
Introduced: 12 Dec 2025
NewCVE-2025-67726 (opens in a new tab)Common Vulnerabilities and Exposures (CVE) are common identifiers for publicly known security vulnerabilities
Common Weakness Enumeration (CWE) is a category system for software weaknesses
How to fix?
Upgrade tornado to version 6.5.3 or higher.
Overview
tornado is a Python web framework and asynchronous networking library, originally developed at FriendFeed.
Affected versions of this package are vulnerable to Excessive Iteration in the _parseparam() function. An attacker can cause the server to become unresponsive and consume excessive CPU resources by sending requests with a large number of maliciously crafted parameters in the Content-Disposition header.