Vulnerability in Spring Reactor Core

[ Description ]Official 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

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund29 Sep 2026WID-SEC-2026-3665

  SOS GmbH JobScheduler: Multiple vulnerabilities allow an unspecified attack Translated from German

  CVE-2026-19032CVE-2026-59889CVE-2026-9563+7 more CVEs

[ References ]References

• spring.io/security/cve-2026-47863