CVE-2026-41680: Marked Project Marked

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

Marked is a markdown parser and compiler. From 18.0.0 to 18.0.1, a critical Denial of Service (DoS) vulnerability exists in marked. By providing a specific 3-byte input sequence a tab, a vertical tab, and a newline (\x09\x0b\n)—an unauthenticated attacker can trigger an infinite recursion loop during parsing. This leads to unbounded memory allocation, causing the host Node.js application to crash via Memory Exhaustion (OOM). This vulnerability is fixed in 18.0.2.

Affected products

• Marked Project Marked: from 18.0.0, before 18.0.2 (fixed in 18.0.2)

Published 2026-04-24. Last modified 2026-06-17.