CVE-2026-115355
Published:October 22, 2026
Updated:October 23, 2026
Mistune before 3.3.0 contains a path traversal vulnerability in the Include directive that allows attackers to read arbitrary files by supplying ../ sequences in include paths. Attackers can also inject HTML through unescaped error messages and included file contents to perform cross-site scripting even when escape=True 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 3.3.0mistune (PYTHON):
Affected version(s) >=0.1.0 <3.3.0Fix Suggestion:
Update to version 3.3.0Related Resources (6)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')