Detections
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Echo: mistune: security update to 3.3.0

medium Tenable Cloud Security Plugin ID 465339

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, the safe_url filter in
 src/mistune/renderers/html.py blocks only javascript:, vbscript:, file:, and data: schemes, allowing
 legacy or chained schemes such as feed:, view-source:, jar:, livescript:, mocha:, ms-its:, mk:, and res:
 to reach rendered href and src attributes and potentially execute script in affected user agents. This
 issue is fixed in version 3.3.0. (CVE-2026-59929)

Solution

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

See Also

https://advisory.echohq.com/cve/CVE-2026-59929

Plugin Details

Severity: Medium

ID: 465339

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Low

Score: 2.3

Percentile: 9.59

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-2026-59929

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: 7/22/2026

Vulnerability Publication Date: 7/8/2026

Reference Information

CVE: CVE-2026-59929