CVE-2026-59324 [HIGH] – When an IntegrationFlow uses .fluxTransform() with an asynchronous/reordering fluxFunction

When an IntegrationFlow uses .fluxTransform() with an asynchronous/reordering fluxFunction that emits raw payloads, concurrent requests on the same FluxMessageChannel subscription have their reply headers (replyChannel, errorChannel, correlationId, any propagated security/tenant headers) copied from whichever message was most recently consumed upstream.
Spring Integration 7.1.0
Spring Integration 7.0.0 – 7.0.5
Spring Integration 6.5.0 – 6.5.10
Spring Integration 6.4.0 – 6.4.12
Spring Integration 5.5.21 and earlier