CVE-2026-41680

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.

CVSS 4.0

8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS 3.1

7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

0.3% chance of exploitation in the next 30 days; higher than 27% of CVEs (scores of 2026-10-26)

CWEs

CWE-400, CWE-674, CWE-835

Published

2026-04-24

Modified

2026-10-26

Record from

the NVD, synced 2026-10-26

Affected

• marked_project:marked

Packages (OSV)

References

• https://github.com/markedjs/marked/security/advisories/GHSA-6v9c-7cg6-27q7
• https://github.com/markedjs/marked/security/advisories/GHSA-6v9c-7cg6-27q7

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