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
Published: 2026-08-26
Score: 5.9 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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References
History

Wed, 02 Sep 2026 00:00:00 +0000

Type Values Removed Values Added
First Time appeared Broadcom
Broadcom reactor Core
CPEs cpe:2.3:a:broadcom:reactor_core:*:*:*:*:*:*:*:*
Vendors & Products Broadcom
Broadcom reactor Core

Tue, 01 Sep 2026 14:45:00 +0000

Type Values Removed Values Added
First Time appeared Spring
Spring reactor Core
Vendors & Products Spring
Spring reactor Core

Thu, 27 Aug 2026 17:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-400

Thu, 27 Aug 2026 15:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-835
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 27 Aug 2026 01:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-400

Thu, 27 Aug 2026 00:30:00 +0000

Type Values Removed Values Added
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
Title Reactor Core bufferTimeout fair-backpressure pipeline permanently hangs when upstream delivers items during an active flush
References
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'}


Subscriptions

Broadcom Reactor Core
Spring Reactor Core
cve-icon MITRE

Status: PUBLISHED

Assigner: vmware

Published:

Updated: 2026-08-27T14:45:41.473Z

Reserved: 2026-05-20T10:00:55.157Z

Link: CVE-2026-47863

cve-icon Vulnrichment

Updated: 2026-08-27T14:45:33.831Z

cve-icon NVD

Status : Analyzed

Published: 2026-08-27T01:17:33.467

Modified: 2026-09-01T23:51:07.060

Link: CVE-2026-47863

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-01T14:23:27Z

Weaknesses