Is CVE-2026-47857 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-47857?

CVE-2026-47857 has a CVSS v3 severity of MEDIUM (5.9).

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CVE-2026-47857

Description

In Reactor Core, applications that use the Flux.windowTimeout operator with fairBackpressure enabled are vulnerable to a Denial of Service (DoS) condition. Reactor Core 3.8.0 - 3.8.6 Reactor Core 3.5.0 - 3.7.19 Reactor Core 3.4.41 and earlier