Detections
Analytics

SCA: security update for mistune (GHSA-8mp2-v27r-99xp)

high Tenable Self-Hosted Container Security Plugin ID 441324

Description

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

 - In versions 3.0.0a1 through 3.2.0 of Mistune, there is a ReDoS (Regular Expression Denial of Service)
 vulnerability in `LINK_TITLE_RE` that allows an attacker who can supply Markdown for parsing to cause
 denial of service. The regular expression used for parsing link titles contains overlapping alternatives
 that can trigger catastrophic backtracking. In both the double-quoted and single-quoted branches, a
 backslash followed by punctuation can be matched either as an escaped punctuation sequence or as two
 ordinary characters, creating an ambiguous pattern inside a repeated group. If an attacker supplies
 Markdown containing repeated ! sequences with no closing quote, the regex engine explores an exponential
 number of backtracking paths. This is reachable through normal Markdown parsing of inline links and block
 link reference definitions. A small crafted input can therefore cause significant CPU consumption and make
 applications using Mistune unresponsive. (CVE-2026-33079)

Solution

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

See Also

https://github.com/advisories/GHSA-8mp2-v27r-99xp

Plugin Details

Severity: High

ID: 441324

Version: Revision 1.8

Type: Local

Family: SCA Checks

Published: 5/7/2026

Updated: 7/2/2026

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

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.72

Vendor

Vendor Severity: High

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS Score Source: CVE-2026-33079

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

CVSS v4

Risk Factor: High

Base Score: 8.7

Threat Score: 6.6

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 5/6/2026

Vulnerability Publication Date: 5/6/2026

Reference Information

CVE: CVE-2026-33079