Detections
Analytics

Amazon Linux 2023 : python3-tornado (ALAS2023-2026-1502)

high Nessus Plugin ID 304575

Synopsis

The remote Amazon Linux 2023 host is missing a security update.

Description

It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2026-1502 advisory.

 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)

Tenable has extracted the preceding description block directly from the tested product security advisory.

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

Solution

Run 'dnf update python-tornado --releasever 2023.10.20260330' or or 'dnf update --advisory ALAS2023-2026-1502 --releasever 2023.10.20260330' to update your system.

See Also

https://alas.aws.amazon.com//AL2023/ALAS2023-2026-1502.html

https://alas.aws.amazon.com/faqs.html

https://explore.alas.aws.amazon.com/CVE-2026-31958.html

Plugin Details

Severity: High

ID: 304575

File Name: al2023_ALAS2023-2026-1502.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 4/1/2026

Updated: 4/1/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

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-2026-31958

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

CVSS v4

Risk Factor: High

Base Score: 8.7

Threat Score: 6.6

Threat Vector: CVSS:4.0/E:U

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: p-cpe:/a:amazon:linux:python3-tornado, p-cpe:/a:amazon:linux:python3-tornado-debuginfo, p-cpe:/a:amazon:linux:python-tornado-doc, p-cpe:/a:amazon:linux:python-tornado-debugsource, cpe:/o:amazon:linux:2023

Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 4/1/2026

Vulnerability Publication Date: 3/11/2026

Reference Information

CVE: CVE-2026-31958