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Python Library Tornado < 6.5.5 Multiple Vulnerabilities

high Nessus Plugin ID 307354

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Synopsis

A Python library installed on the remote host is affected by multiple vulnerabilities.

Description

The version of the Tornado Python library installed on the remote host is prior to 6.5.5. It is, therefore, affected by multiple vulnerabilities:

 - Tornado is a Python web framework and asynchronous networking library. In versions of Tornado prior to 6.5.5, the only limit on the number of parts in multipart/form-data is the max_body_size setting (default 100MB). Since parsing occurs synchronously on the main thread, this creates the possibility of denial-of-service due to the cost of parsing very large multipart bodies with many parts. This vulnerability is fixed in 6.5.5. (CVE-2026-31958)

 - In Tornado before 6.5.5, cookie attribute injection could occur because the domain, path, and samesite arguments to .RequestHandler.set_cookie were not checked for crafted characters. (CVE-2026-35536)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade to Tornado version 6.5.5 or later.

See Also

http://www.nessus.org/u?d35db1c1

http://www.nessus.org/u?933ce63d

Plugin Details

Severity: High

ID: 307354

File Name: python_tornado_6_5_5.nasl

Version: 1.4

Type: Local

Agent: windows, macosx, unix

Family: Misc.

Published: 4/17/2026

Updated: 6/5/2026

Configuration: Enable thorough checks (optional)

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: High

Base Score: 7.8

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

CVSS Score Source: CVE-2026-31958

CVSS v3

Risk Factor: High

Base Score: 7.5

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

CVSS v4

Risk Factor: High

Base Score: 8.7

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Vulnerability Information

CPE: cpe:/a:tornadoweb:tornado

Required KB Items: installed_sw/tornado

Patch Publication Date: 3/10/2026

Vulnerability Publication Date: 3/10/2026

Reference Information

CVE: CVE-2026-31958, CVE-2026-35536

IAVB: 2026-B-0068