CVE-2026-115353: mistune 0 to before 3.3.0

Affected technology

mistune · 0 to before 3.3.0
lepture

Description’s affected range: before 3.3.0

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 4.0): Network (remote) · No privileges required · No user interaction required

What an attacker can do

Attackers can submit markdown containing include directives referencing ../ sequences or absolute paths to embed sensitive files like credentials or environment data in rendered HTML. Vendor/CNA’s CVSS 4.0 assessment (base score 9.2/10) rates confidentiality impact as high; integrity and availability impact as none.