CVE-2026-115350

Medium

Description

Mistune before 3.3.0 contains a cross-site scripting vulnerability in the Include directive that emits included .html, .xhtml, or .htm file content as raw block_html tokens. Attackers who can plant an HTML file readable by the renderer can reference it via an include directive, combined with path traversal, to execute stored scripts when escape=False is set.

SeverityMedium

CVSS6.1

Exploit probability—

ProductLepture Mistune

PublishedOct 22, 2026

First seenOct 22, 2026

Weakness typeCWE-79Cross-site scripting (XSS)

How to fix

Update

lepture mistune3.3.0 or later

Vendor advisories

github.com/lepture/mistune/security/advisories/GHSA-96vr-jm8v-g22j

Affected products

Product	Affected versions	Fixed in
lepture mistune	v < 3.3.0	3.3.0

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