AIKIDO-2026-592409
reactor-netty-core is vulnerable to Improper Restriction of Communication Channel
37
Low Risk
This Affects:
reactor-netty-coreTL;DR
reactor-netty-core can reuse a previously configured DNS resolver when multiple clients are created with different resolver settings. Traffic may then be resolved and routed to an unintended destination. This requires dynamically created clients such as HttpClient or TcpClient with custom DNS configuration. The patch keeps DNS resolvers isolated per client.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and the application dynamically creates multiple Reactor Netty clients with different DNS resolver configurations.
Background info
reactor-netty-core is vulnerable to Improper Restriction of Communication Channel in versions 0.0.1 - 1.3.6.
How to fix this
Upgrade the io.projectreactor.netty:reactor-netty-core library to the patch version.
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SOC 2Compliant
ISO 27001Compliant