CVE-2026-47857

Severity CVSS v4.0:

Pending analysis

Type:

Unavailable / Other

Publication date:

27/08/2026

Last modified:

27/08/2026

Description

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

Impact

Vector 3.x

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 5.90 MEDIUM
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x

5.90

Severity 3.x

MEDIUM

References to Advisories, Solutions, and Tools

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