What’s Vulnerable › Vulnerabilities
CVE-2026-47874: Reactor Netty HTTP Server Denial of Service With Pipelined Requests
- Severity: medium (CVSS 5.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-08-27 · updated 2026-09-02
- Weakness: CWE-770
Description
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
Affected products
- Pivotal Reactor Netty: before 1.0.53; from 1.1.0 before 1.2.19; from 1.3.0 before 1.3.6.1 — fixed in 1.0.53, 1.2.19, 1.3.6.1
How to fix
Upgrade to a fixed version: Pivotal Reactor Netty 1.0.53, 1.2.19, 1.3.6.1. Check the vendor advisory for mitigations.
References
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