Detections
Analytics

Echo: pymdown-extensions: security update to 11.0.1

high Tenable Cloud Security Plugin ID 461195

Description

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

 - pymdown-extensions is a collection of extensions for the Python Markdown library. In versions up to and
 including 11.0, four inline processors (caret, tilde, betterem, and magiclink) use regular expressions
 whose content groups can partition a run of delimiter characters in exponentially many ways, causing
 catastrophic backtracking. As a result, a single untrusted Markdown line under 50 bytes rendered with
 markdown.markdown() in each extension's default configuration drives the rendering thread into unbounded
 CPU usage that grows exponentially with input length, enabling an unauthenticated remote attacker who can
 submit Markdown to cause denial of service. The exposure is concrete for web applications that render
 user-supplied Markdown (comments, wikis, issue bodies, live preview), including any app using
 pymdownx.extra which bundles the vulnerable betterem default, as well as hosted docs/CI systems that build
 untrusted Markdown. The issue has been fixed in version 11.0.1. (CVE-2026-67422)

Solution

Update the pymdown-extensions library and its related packages to version 11.0.1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-67422

Plugin Details

Severity: High

ID: 461195

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/3/2026

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

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.75

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-2026-67422

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

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 8/9/2026

Vulnerability Publication Date: 8/6/2026

Reference Information

CVE: CVE-2026-67422