CVE-2021-30027: MD4C Project MD4C

Medium severity, CVSS 5.5. EPSS: 0.7% chance of exploitation in the next 30 days.

md_analyze_line in md4c.c in md4c 0.4.7 allows attackers to trigger use of uninitialized memory, and cause a denial of service via a malformed Markdown document.

Affected products

• MD4C Project MD4C: version 0.4.7 only

Published 2021-04-29. Last modified 2026-06-17.