Detections
Analytics

Echo: tornado: security update to 6.5.3

high Tenable Self-Hosted Container Security Plugin ID 464153

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - 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. (CVE-2025-67726)

Solution

Update the tornado library and its related packages to version 6.5.3 or later.

See Also

https://advisory.echohq.com/cve/CVE-2025-67726

Plugin Details

Severity: High

ID: 464153

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/3/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.36

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2025-67726

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 8/12/2026

Vulnerability Publication Date: 12/12/2025

Reference Information

CVE: CVE-2025-67726

IAVB: 2026-B-0009-S