Detections
Analytics

Echo: mistune: security update to 3.3.0

high Tenable Cloud Security Plugin ID 455371

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 3.3.0, a Markdown document
 containing many repeated or distinct reference-link definitions causes quadratic work in
 src/mistune/block_parser.py and the ref_links environment dictionary handling, allowing denial of service
 through CPU exhaustion. This issue is fixed in version 3.3.0. (CVE-2026-59928)

Solution

Update the mistune library and its related packages to version 3.3.0 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-59928

Plugin Details

Severity: High

ID: 455371

Version: Revision 1.1

Type: Local

Published: 10/1/2026

Updated: 10/1/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.77

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.1

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

CVSS Score Source: CVE-2026-59928

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.7

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:P/RL:O/RC:C

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 7/22/2026

Vulnerability Publication Date: 7/8/2026

Reference Information

CVE: CVE-2026-59928