CVE-2026-115350
Published:October 22, 2026
Updated:October 23, 2026
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.
Affected Packages
mistune (CONDA):
Affected version(s) >=3.0.0 <3.3.1Fix Suggestion:
Update to version 3.3.1https://github.com/lepture/mistune.git (GITHUB):
Affected version(s) >=v3.0.0a1 <v3.3.0Fix Suggestion:
Update to version v3.3.0mistune (PYTHON):
Affected version(s) >=3.0.0a1 <3.3.0Fix Suggestion:
Update to version 3.3.0Related Resources (2)
Do you need more information?
Contact UsCVSS v4
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
LOW
Subsequent System Integrity
LOW
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.1
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')