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VMwareCVE-2026-47857

VMware Reactor Core: denial of service

Medium5.9CVE-2026-47857 · Published Aug 27, 2026 · updated Sep 4, 2026

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

VMware advisory

Affected versions

PackageAffectedFixed in
Reactor Core
Product
>= 3.8.0, <= 3.8.6No fix yet
>= 3.5.0, <= 3.7.19No fix yet
<= 3.4.41No fix yet
Details and references
CVSS 3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Severity from
the vendor (its own CVE record or advisory)
Weakness
CWE-190

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