CVE-2018-1000518: Websockets Project Websockets

High severity, CVSS 7.5. EPSS: 1.8% chance of exploitation in the next 30 days.

aaugustin websockets version 4 contains a CWE-409: Improper Handling of Highly Compressed Data (Data Amplification) vulnerability in Servers and clients, unless configured with compression=None that can result in Denial of Service by memory exhaustion. This attack appear to be exploitable via Sending a specially crafted frame on an established connection. This vulnerability appears to have been fixed in 5.

Affected products

Published 2018-06-26. Last modified 2026-06-17.