Medium [CVE-2026-47857] Denial of Service via Flux.windowTimeout operator with fairBackpressure
This medium-severity Red Hat Linux advisory covers CVE-2026-47857 affecting Exploit Intelligence, Red Hat build of Apache Camel 4 for Quarkus 3, Red Hat build of Debezium 3.
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Summary
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 This could cause applications to become unresponsive or crash.
The impact is confined to service availability and requires the specific operator and backpressure setting to be actively deployed within the application. Red Hat severity: Moderate — CVSS 5.9 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-770. Affected Red Hat products: Exploit Intelligence; Red Hat build of Apache Camel 4 for Quarkus 3; Red Hat build of Debezium 3; Red Hat build of Quarkus; Red Hat Data Grid 8; Red Hat Fuse 7.
Will not fix / out of support: Exploit Intelligence; Red Hat Fuse 7. Red Hat does not currently list a fixing RHSA for this CVE.
- 3.8.0
- 3.8.6
- 3.5.0
- 3.7.19
- 3.4.41
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
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