GHSA-h7ww-273w-6cm8
Mistune: Path Traversal and XSS in Include directive
At a glance
- Published
- Updated
- CVE
- CVE-2026-115355
Description
The Include directive in `src/mistune/directives/include.py` does not validate that the resolved file path stays within the source directory, allowing path traversal via `../` sequences to read arbitrary files. Additionally, error messages and included file contents are rendered without HTML escaping, leading to XSS even when `escape=True`. Affected functions: - Path resolution (lines 27-31) - `block_error()` in html.py (line 140) - `render_html_include()` (line 72) The Include plugin must be explicitly enabled via the plugins parameter.
Affected packages
| Package | Versions |
|---|---|
| PyPI · mistune | introduced 0, fixed 3.3.0 |
References
- https://github.com/lepture/mistune/security/advisories/GHSA-h7ww-273w-6cm8 WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-115355 ADVISORY
- https://github.com/lepture/mistune/commit/1bef343ade163fc3bb95572b15be720084cdb993 WEB
- https://github.com/lepture/mistune PACKAGE
- https://github.com/lepture/mistune/releases/tag/v3.3.0 WEB
- https://www.vulncheck.com/advisories/mistune-before-3.3.0-path-traversal-and-xss-via-include-directive WEB
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — GitHub Advisory Database |