High 8.6Published Oct 22, 2026

CVE-2026-115353Mistune before 3.3.0 Path Traversal via include Directive

Updated under an hour ago (Oct 28, 2026, 12:40 AM ET)

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It affects lepture mistune. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.39%, higher than 33% of scored CVEs.

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Every CVE for lepture mistune

Exploited in the last 30 days

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.

CVSS: 8.6 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Weakness (CWE): CWE-22
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.39% (percentile 33)
Assigned by: VulnCheck
NVD analysis: Deferred
Record last updated: Oct 22, 2026
First seen by InfoSec Signals: Oct 22, 2026

Affected products

Affected products

lepture mistune lepture:mistune (from the name)	before 3.3.0; 3.3.0 not affected	CNA record

References

References

https://github.com/lepture/mistune/security/advisories/GHSA-9jjx-3hq3-hx4j	vendor-advisory
https://www.vulncheck.com/advisories/mistune-before-3.3.0-path-traversal-via-include-directive	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.