TI-2026-32595 Aliases CVE-2026-44708 GHSA-8g87-j6q8-g93x

Mistune Math Plugin XSS Escape Bypass

MEDIUM 60CWE-79Published 2026-05-26 · Updated 2026-05-27

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Cross-site scripting
Confidentiality · integrity · availability: Low · Low · None
Fix status: Partial Red Hat: 4 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-79.

Summary

Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.2.1, the mistune math plugin renders inline math ($...$) and block math ($$...$$) by concatenating the raw user-supplied content directly into the HTML output without any HTML escaping. This occurs even when the parser is explicitly created with escape=True, which is supposed to guarantee that all user-controlled text is sanitised before reaching the DOM. This vulnerability is fixed in 3.2.1.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00228 13th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Partial mistune (lepture): 3.2.1Red Hat: 4 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
lepture	mistune	before 3.2.1	3.2.1	Patch available	CNA
—	mistune (PyPI)	up to 3.2.0	—	No fix listed	GHSA-8g87-j6q8-g93x

mistune Vendorlepture Affected before 3.2.1 Fixed in 3.2.1 Patch available CNA
mistune (PyPI) Vendor— Affected up to 3.2.0 Fixed in — No fix listed GHSA-8g87-j6q8-g93x

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:mistune_project:mistune::::::::	before 3.2.1	Vulnerable	lepture

cpe:2.3:a:mistune_project:mistune:*:*:*:*:*:*:*:* Versions before 3.2.1 Vulnerable ·lepture

Remediation

Fix · CNA mistune (lepture) Fixed in 3.2.1

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
Migration Toolkit for Applications 8	Affected	No fix yet: Fix deferred
Red Hat OpenShift AI (RHOAI)	Affected	No fix yet: Fix deferred
Red Hat OpenShift Container Platform 4	Affected	No fix yet: Fix deferred
Red Hat Satellite 6	Affected	No fix yet: Fix deferred

Timeline

2026-10-02 Threatist record created from CVE-2026-44708
2026-10-03 Alias added: GHSA-8g87-j6q8-g93x

References

Exploit 1

https://github.com/lepture/mistune/security/advisories/GHSA-8g87-j6q8-g93x

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-44708

Other 2

TI-2026-42736 Mistune block_parser: quadratic-time parsing on long lists of repeated reference-link definitions CVSS 3.1HIGH 7.5
TI-2026-42730 Regular expression denial of service in lepture mistune CVSS 3.1HIGH 7.5
TI-2026-42731 Mistune: XSS via percent-encoded javascript URI bypass in safe_url() CVSS 3.1MEDIUM 6.1
TI-2026-32774 Mistune Image Directive CSS Injection Vulnerability CVSS 3.1MEDIUM 6.1
TI-2026-32773 Mistune TOC Anchor Injection XSS CVSS 3.1MEDIUM 6.1
TI-2026-42738 Insufficient verification of data authenticity in lepture mistune CVSS 3.1MEDIUM 4.3

See all 16 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences