SCA: security update for mistune (GHSA-v87v-83h2-53w7)

medium Tenable Self-Hosted Container Security Plugin ID 441569

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, HTMLRenderer.heading()
builds the opening <hN> tag by string-concatenating the id attribute value directly into the HTML — with
no call to escape(), safe_entity(), or any other sanitisation function. A double-quote character " in the
id value terminates the attribute, allowing an attacker to inject arbitrary additional attributes (event
handlers, src=, href=, etc.) into the heading element. This vulnerability is fixed in 3.2.1.
(CVE-2026-44897)

Solution

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

Plugin Details

Severity: Medium

ID: 441569

Version: Revision 1.5

Type: Local

Family: SCA Checks

Published: 5/9/2026

Updated: 5/29/2026

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-2026-44897

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: 5/9/2026

Vulnerability Publication Date: 5/9/2026

Reference Information

CVE: CVE-2026-44897

cwe: CWE-79

Detections

Analytics