Path Traversal in Lepture Mistune
CVE-2026-115353
Mistune before 3.3.0 contains a path traversal vulnerability in the RST include directive that allows attackers to read arbitrary files by supplying relative or absolute paths. Attackers can submit markdown containing include directives referencing ../ sequences or absolute paths to embed sensitive files like credentials or environment data in rendered HTML.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/lepture/mistune/security/advisories/GHSA-9jjx-3hq3-hx4j (vendor-advisory)
- www.vulncheck.com/advisories/mistune-before-3.3.0-path-traversal-via-include-di… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-115353?
- CVE-2026-115353 is a high-severity vulnerability in Lepture Mistune, classified under Path Traversal. CVSS score: 8.6/10. Published 2026-10-22.
- How severe is CVE-2026-115353?
- High severity. CVSS v3 base score is 8.6 out of 10.