CVE-2026-115355CWE-22path-traversal

CVE-2026-115355

High · published October 22, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
31.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
8.7 · 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
EPSS
0.00387 · 31.7th percentile
Weakness
CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Published
2026-10-22T23:17Z
References (2)
https://github.com/lepture/mistune/security/advisories/GHSA-h7ww-273w-6cm8 · [email protected]https://www.vulncheck.com/advisories/mistune-before-3.3.0-path-traversal-and-xss-via-include-directive · [email protected]
EPSS history
Timeline
  • 24 OCT 03:52Z
    EPSS moved — → 0%
    epss
  • 22 OCT 19:13Z
    Mistune before 3.3.0 Path Traversal and XSS via Include Directive
    cvelistv5
  • 22 OCT 19:13Z
    Mistune before 3.3.0 Path Traversal and XSS via Include Directive
    cvelistv5