CVE-2026-41680: Marked Vulnerable to OOM Denial of Service via Infinite Recursion in marked Tokenizer

April 29, 2026

A critical Denial of Service (DoS) vulnerability exists in marked@18.0.0. 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).

References

github.com/advisories/GHSA-6v9c-7cg6-27q7
github.com/markedjs/marked/security/advisories/GHSA-6v9c-7cg6-27q7
nvd.nist.gov/vuln/detail/CVE-2026-41680

Code Behaviors & Features

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