CVE-2026-41680CWE-400CWE-674CWE-835

Marked: OOM Denial of Service via Infinite Recursion in marked Tokenizer

High · published April 24, 2026

CVSS v4.0
8.7
EPSS
1%
Percentile
42.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
8.7 · HIGH
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
EPSS
0.00508 · 42.6th percentile
Weaknesses
CWE-400 · Uncontrolled Resource Consumption; CWE-674 · Uncontrolled Recursion; CWE-835 · Loop with Unreachable Exit Condition ('Infinite Loop')
Published
2026-04-24T17:26Z
EPSS history
Timeline
  • 24 APR 17:26Z
    Marked: OOM Denial of Service via Infinite Recursion in marked Tokenizer
    cvelistv5