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CVE-2026-47857

Reactor Core windowTimeout fair-backpressure stream hang due to 20-bit index wrap-around

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

CVSS 3.1 · 5.9 Medium EPSS < 1% KEV · Not listed
Vendors
Broadcom Spring
Products
Reactor Core Reactor Core
CVE-2026-47863

Reactor Core bufferTimeout fair-backpressure pipeline permanently hangs when upstream delivers items during an active flush

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

CVSS 3.1 · 5.9 Medium EPSS < 1% KEV · Not listed
Vendors
Broadcom Spring
Products
Reactor Core Reactor Core