Reactor Netty 1.1-1.3 HTTP/1.1 Pipelining Memory Exhaustion
CVE-2026-47874 Published on August 26, 2026
Reactor Netty HTTP Server Denial of Service With Pipelined Requests
The vulnerability occurs when a client sends HTTP/1.1 pipelined requests over a single connection, causing the Reactor Netty HTTP server to consume an excessive amount of memory.
Reactor Netty 1.3.0 - 1.3.6
Reactor Netty 1.1.0 - 1.2.18
Reactor Netty 1.0.52 and earlier
Vulnerability Analysis
CVE-2026-47874 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a small impact on availability.
Weakness Type
Allocation of Resources Without Limits or Throttling
The software allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor.
Products Associated with CVE-2026-47874
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Affected Versions
Spring Reactor Netty:- Version 1.3.0, <= 1.3.6 is affected.
- Version 1.1.0, <= 1.2.18 is affected.
- Before and including 1.0.52 is affected.