CVE-2026-59324

fluxTransform shared RequestMessageHolder causes cross-message header leakage under async fluxFunction

HIGH

8.2

CVSS Score

Published: August 27, 2026 at 06:04 PM UTC

Updated: September 1, 2026 at 11:51 PM UTC

2 products affected across 2 vendorsSpring IntegrationSpring Integration

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Severity

HIGH8.2

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

Description

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

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Spring Integration · VMware

95%

v < 5.5.226.4.0 ≤ v < 6.4.136.5.0 ≤ v < 6.5.117.0.0 ≤ v < 7.0.5.17.1.0 ≤ v < 7.1.0.1

Affected range stops below 5.5.22, so it looks safe — our inference, not a vendor statement

Affected range stops below 6.4.13, so it looks safe — our inference, not a vendor statement

Affected range stops below 6.5.11, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.0.5.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.1.0.1, so it looks safe — our inference, not a vendor statement

Spring Integration · Spring

60%

v ≤ 5.5.216.4.0 ≤ v ≤ 6.4.126.5.0 ≤ v ≤ 6.5.107.0.0 ≤ v ≤ 7.0.56.4.0 6.5.0 7.0.0 7.1.0

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://spring.io/security/cve-2026-59324

References (1)

Vendor Advisory

Source: cverecord

https://spring.io/security/cve-2026-59324

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.2HIGHvmware

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: LOW
Availability: NONE

Vector?

Quick Info

StatusANALYZED

CWE

CWE-362

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