CVE-2026-115353

CVSS 9.2 (critical) · published 2026-10-22

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.

Weakness: CWE-22

Source: NVD CVE-2026-115353

References

• https://github.com/lepture/mistune/security/advisories/GHSA-9jjx-3hq3-hx4j
• 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

Check your software

Connect an AI agent to the FixLane MCP server or ask the Telegram bot to check what you have installed against incidents with a verified fixed version.