AIKIDO-2026-268979
reactor-core is vulnerable to Denial of Service (DoS)
59
Medium Risk
This Affects:
reactor-coreTL;DR
reactor-core Flux.windowTimeout with fair backpressure can hang after a 20-bit index wrap on a long-lived stream. A client that keeps the stream open and manipulates read speed can stop element processing without an error. Held subscriptions then exhaust resources. The patch prevents the wrap-around from permanently stalling the operator.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you use Flux.windowTimeout with fair backpressure enabled.
Background info
reactor-core is vulnerable to Denial of Service (DoS) in versions 0.0.1 - 3.8.6.
How to fix this
Upgrade the io.projectreactor:reactor-core library to the patch version.
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SOC 2Compliant
ISO 27001Compliant