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CVE-2025-67726

7.5 · HIGH

Tornado is a Python web framework and asynchronous networking library.

Published Dec 12, 2025CWE-400EPSS 0.53%

Overview

CVE-2025-67726 is a high-severity vulnerability. It was published on December 12, 2025 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Tornado is a Python web framework and asynchronous networking library. Versions 6.5.2 and below use an inefficient algorithm when parsing parameters for HTTP header values, potentially causing a DoS. The _parseparam function in httputil.py is used to parse specific HTTP header values, such as those in multipart/form-data and repeatedly calls string.count() within a nested loop while processing quoted semicolons. If an attacker sends a request with a large number of maliciously crafted parameters in a Content-Disposition header, the server's CPU usage increases quadratically (O(n²)) during parsing. Due to Tornado's single event loop architecture, a single malicious request can cause the entire server to become unresponsive for an extended period. This issue is fixed in version 6.5.3.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/tornadoweb/tornado/commit/771472cfdaeebc0d89a9cc46e249f8891a6b29cdGitHubgithub.com/tornadoweb/tornado/releases/tag/v6.5.3GitHubgithub.com/tornadoweb/tornado/security/advisories/GHSA-jhmp-mqwm-3gq8

How CyberStrike helps

Frequently asked questions

What is CVE-2025-67726?

CVE-2025-67726 is a high-severity vulnerability. It was published on December 12, 2025 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-67726?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-67726?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-67726?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-67726 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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