CVE-2026-115355

Mistune before 3.3.0 Path Traversal and XSS via Include Directive

Published Oct 22, 2026 CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-h7ww-273w-6cm8 Mistune: Path Traversal and XSS in Include directive
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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.
Title Mistune before 3.3.0 Path Traversal and XSS via Include Directive
First Time appeared Mistune Project
Mistune Project mistune
Weaknesses CWE-22
CPEs cpe:2.3:a:mistune_project:mistune:*:*:*:*:*:*:*:*
Vendors & Products Mistune Project
Mistune Project mistune
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}

cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Oct 29, 2026, 1:48 PM
Reserved
Oct 22, 2026, 11:20 AM
Status
Deferred
Published
Oct 22, 2026, 7:17 PM
Modified
Oct 29, 2026, 2:17 PM
Severity
Important
Public date
Oct 22, 2026, 7:13 PM