CVE-2026-47857

MediumCVSS 5.9/10Last modified Sep 4, 2026

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

Metrics

CVSS 3.1 5.9/10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-190

Affected software

Vendor	Product	Versions
Spring	Reactor Core	>= 3.8.0, <= 3.8.6; >= 3.5.0, <= 3.7.19; <= 3.4.41

References

https://spring.io/security/cve-2026-47857Vendor Advisory

Timeline

Published: Aug 27, 2026
Last modified: Sep 4, 2026
NVD status: Analyzed

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