CVE-2026-33219

A flaw was found in NATS-Server. A malicious client connecting to the WebSockets port can cause unbounded memory use before authentication by sending a large amount of data. This resource exhaustion vulnerability can lead to a Denial of Service DoS for the server, making it unavailable to...

CVE-2026-33219: Allocation of Resources Without Limits or Throttling

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, a malicious client which can connect to the WebSockets port can cause unbounded memory use in the nats-server before authentication; this requires sending a...