This indicates an attack attempt to exploit a Denial Of Service Vulnerability in Node.js.
The vulnerability is due to an error in the vulnerable application when handling a maliciously crafted request. A remote attacker may be able to exploit this to cause a denial of service condition on the affected system.
Node.js Node.js 10.x prior to 10.4.1
Node.js Node.js 8.x to 8.11.3
Node.js Node.js 9.x to 9.11.2
Denial of Service: Remote attackers can crash vulnerable systems.
Apply the most recent upgrade or patch from the vendor: