---
title: "CVE-2026-115353: Mistune - Path Traversal"
description: "Mistune < 3.3.0 contains a path traversal caused by improper handling of RST include directive, letting attackers read arbitrary files by supplying relative or absolute paths, exploit requires crafted markdown input."
url: https://panop.io/threat-heartbeat/CVE-2026-115353/
---

# CVE-2026-115353 Mistune - Path Traversal

Mistune < 3.3.0 contains a path traversal caused by improper handling of RST include directive, letting attackers read arbitrary files by supplying relative or absolute paths, exploit requires crafted markdown input.

CVSS base score 8.6 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-115353)

## Details

Type

Path Traversal

Impact

File System Read, Information Disclosure

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Published

22 October 2026

Updated

23 October 2026

Weakness

[CWE-22](https://cwe.mitre.org/data/definitions/22.html)

## Vendor fix

Update to version 3.3.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-115353](https://nvd.nist.gov/vuln/detail/CVE-2026-115353)
- [https://www.vulncheck.com/advisories/mistune-before-3.3.0-path-traversal-via-include-directive](https://www.vulncheck.com/advisories/mistune-before-3.3.0-path-traversal-via-include-directive)
- [https://github.com/lepture/mistune/security/advisories/GHSA-9jjx-3hq3-hx4j](https://github.com/lepture/mistune/security/advisories/GHSA-9jjx-3hq3-hx4j)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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