SCA: security update for mistune (GHSA-ccfx-mfmx-2fx9)

medium Tenable Cloud Security Plugin ID 441851

Description

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

- Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.2.1, the Image directive plugin
validates the :width: and :height: options with a regex compiled as _num_re =
re.compile(r"^\d+(?:\.\d*)?"). When the validated value is not a plain integer, render_block_image()
inserts it directly into a style="width:...;" or style="height:...;" attribute. Because the value was
accepted by the prefix-only regex, any CSS after the leading digits reaches the style= attribute verbatim
and without escaping. This vulnerability is fixed in 3.2.1. (CVE-2026-44899)

Solution

Update the mistune library and its related packages to version 3.2.1 or later.

Plugin Details

Severity: Medium

ID: 441851

Version: Revision 1.7

Type: Local

Family: SCA Checks

Published: 5/14/2026

Updated: 7/2/2026

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

Risk Information

VPR

Risk Factor: Low

Score: 2.3

Percentile: 9.43

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 5

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

CVSS Score Source: CVE-2026-44899

CVSS v3

Risk Factor: Medium

Base Score: 6.1

Temporal Score: 5.5

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

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

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 5/14/2026

Vulnerability Publication Date: 5/14/2026

Reference Information

CVE: CVE-2026-44899

cwe: CWE-79

Detections

Analytics