Vulnerability DatabaseCVE-2026-47857
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CVE-2026-47857
Published:August 26, 2026
Updated:September 24, 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
Affected Packages
https://github.com/reactor/reactor-core.git (GITHUB):
Affected version(s) >=v3.8.0 <v3.8.7
Fix Suggestion:
Update to version v3.8.7
io.projectreactor:reactor-core (JAVA):
Affected version(s) >=3.8.0 <3.8.7
Fix Suggestion:
Update to version 3.8.7
Related Resources (1)
https://spring.io/security/cve-2026-47857
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CVSS v4
Base Score:
8.2
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.9
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Integer Overflow or Wraparound
CWE-190
EPSS
Base Score:
0.22