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Python Library Tornado < 6.5.5 Cookie Attribute Injection

medium Nessus Plugin ID 307354

Synopsis

A Python library installed on the remote host is affected by a cookie attribute injection vulnerability.

Description

The version of the Tornado Python library installed on the remote host is prior to 6.5.5. It is, therefore, affected by a cookie attribute injection vulnerability:

 - Cookie attribute injection could occur because the domain, path, and samesite arguments to RequestHandler.set_cookie were not checked for crafted characters. In particular, semicolons would be allowed, which could be used to inject attacker-controlled values for other cookie attributes. (CVE-2026-35536)

Note that Nessus has not tested for this issue 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

Plugin Details

Severity: Medium

ID: 307354

File Name: python_tornado_6_5_5.nasl

Version: 1.1

Type: Local

Agent: windows, macosx, unix

Family: Misc.

Published: 4/17/2026

Updated: 4/17/2026

Configuration: Enable thorough checks (optional)

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 2.2

CVSS v2

Risk Factor: Medium

Base Score: 5

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

CVSS Score Source: CVE-2026-35536

CVSS v3

Risk Factor: Medium

Base Score: 5.3

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

CVSS v4

Risk Factor: Medium

Base Score: 6.9

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/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-2026-35536

IAVB: 2026-B-0068