Denial-of-Service (DoS)

Reactor Core is vulnerable to a Denial-of-Service DoS. The vulnerability is due to improper handling of the Flux.windowTimeout operator when fairBackpressure is enabled, which allows an attacker to trigger excessive resource consumption and potentially exhaust application resources...

CVE-2026-47857

A flaw was found in Reactor Core. A remote attacker could exploit this vulnerability by using the Flux.windowTimeout operator with fairBackpressure enabled, leading to a Denial of Service DoS condition. This could cause applications to become unresponsive or crash. Mitigation Mitigation for this...

CVE-2026-47863

A flaw was found in Reactor Core. Applications using the Flux.bufferTimeout operator with fairBackpressure enabled are vulnerable to a Denial of Service DoS condition. This occurs when upstream components deliver items during an active flush, causing the processing pipeline to permanently hang an...

EUVD-2026-66824

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...

EUVD-2026-66828

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...

CVE-2026-47863

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...

CVE-2026-47857

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...

CVE-2026-47863: Loop with Unreachable Exit Condition

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...

CVE-2026-47857: Integer Overflow or Wraparound

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...

CVE-2026-47863

Reactor Core versions 3.8.0–3.8.6 and 3.7.19 and earlier are vulnerable to a Denial of Service condition in the Flux.bufferTimeout operator when fairBackpressure is enabled. The root cause is a race condition between flushing buffered items and the arrival of new upstream items during an active f...

CVE-2026-47863 Reactor Core bufferTimeout fair-backpressure pipeline permanently hangs when upstream delivers items during an active flush

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...

CVE-2026-47857 Reactor Core windowTimeout fair-backpressure stream hang due to 20-bit index wrap-around

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...

PT-2026-82357

Name of the Vulnerable Software and Affected Versions Reactor Core versions 3.0.0 through 3.7.19 Reactor Core versions 3.8.0 through 3.8.6 Description Applications using the Flux.bufferTimeout operator with fairBackpressure enabled are susceptible to a Denial of Service DoS condition. Fair...

PT-2026-82352

Name of the Vulnerable Software and Affected Versions Reactor Core versions 3.8.0 through 3.8.6 Reactor Core versions 3.5.0 through 3.7.19 Reactor Core versions 3.4.41 and earlier Description Applications using the Flux.windowTimeout operator with fairBackpressure enabled are susceptible to a...

Allocation of Resources Without Limits or Throttling

Overview Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling in the Flux.windowTimeout function when fairBackpressure is enabled. An attacker can cause the stream to hang indefinitely and exhaust system resources by maintaining long-lived...

Race Condition

Overview Affected versions of this package are vulnerable to Race Condition in the Flux.bufferTimeout process with fairBackpressure enabled when a race condition occurs between flushing buffered items and the arrival of new upstream items. An attacker can cause the stream to hang indefinitely and...