The marked package before 0.3.4 for Node.js allows attackers to cause a denial of service (CPU consumption) via unspecified vectors that trigger a "catastrophic backtracking issue for the em inline rule," aka a "regular expression denial of service (ReDoS)."
https://support.f5.com/csp/article/K05052081?utm_source=f5support&%3Butm_medium=RSS