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OpenAdvisories
Medium · 5.9 CVE-2026-47863 EUVD-2026-66828GHSA-5jp2-w3vg-5w3x

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

Published Aug 26, 2026 · Updated Aug 27, 2026 · Assigned by vmware

Description

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

Affected products

VendorProductAffectedFixed
Spring Reactor Core 3.8.0 – ≤ 3.8.6, ≤ 3.7.19 —

Advisories 1

References