CVE-2026-59324
Description
A flaw was found in Spring Integration. When an IntegrationFlow uses .fluxTransform() with an asynchronous fluxFunction that emits raw payloads, concurrent requests on the same FluxMessageChannel subscription can have their reply headers copied from other messages. This information disclosure vulnerability allows an attacker to potentially access sensitive data such as replyChannel, errorChannel, correlationId, or other security-related headers from concurrent requests.
Statement
A concurrency-related context leakage vulnerability exists in Spring Integration's reactive fluxTransform() function when processing raw payloads on a shared FluxMessageChannel. Under concurrent request loads, the transformer copies message headers—including replyChannel, errorChannel, correlationId, and security or tenant context—from the most recently consumed upstream message rather than maintaining request isolation. Unauthenticated remote attackers sending concurrent requests can intercept sensitive routing headers and cross-tenant security tokens, leading to information disclosure and potential message misrouting across session boundaries.
Mitigation
Avoid using raw payload emission inside asynchronous fluxTransform() functions on shared FluxMessageChannel subscriptions, or wrap reactive emissions in Message<T> instances to preserve header isolation per request.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 8.2 | N/A | 8.2 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | High | N/A | High |
| Integrity Impact | Low | N/A | Low |
| Availability Impact | None | N/A | None |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Understanding the Weakness (CWE)
Integrity,Confidentiality,Other
Technical Impact: Modify Application Data; Read Application Data; Alter Execution Logic
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