CVE-2023-26303: Executablebooks Markdown-It-Py

Medium severity, CVSS 5.5. EPSS: 0.2% chance of exploitation in the next 30 days.

Denial of service could be caused to markdown-it-py, before v2.2.0, if an attacker was allowed to force null assertions with specially crafted input.

Affected products

• Executablebooks Markdown-It-Py: before 2.2.0 (fixed in 2.2.0)

Published 2023-02-23. Last modified 2026-06-17.