# CVE-2026-59305: Spring Cloud Stream partition interceptor improper message handling

Source: https://junglewise.ai/threats/cve-2026-59305-spring-cloud-stream-partition-interceptor-improper-message  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-27. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-59305 · Severity: low · CVSS 3.1 · Published 2026-08-27

Spring Cloud Stream is a framework used to build message-driven microservices that process and route data across distributed systems. A vulnerability in the partition interceptor can cause improper handling of messages during transmission, potentially leading to data routing errors or unexpected message loss in message-broker deployments.

Technologies: [VMware Spring Cloud Stream](https://junglewise.ai/threats/technologies/spring-cloud-stream). Vendors: [VMware](https://junglewise.ai/threats/vendors/vmware).

## Quick answers

**Is CVE-2026-59305 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-59305 being exploited in the wild.

**How severe is CVE-2026-59305?** Low severity, with a CVSS score of 3.1, published 27 August 2026.

**Which products and versions are affected?** VMware Spring Cloud Stream 4.2.0–4.2.6, 4.3.0–4.3.3, 5.0.0–5.0.2.

**Is there a fix for CVE-2026-59305?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**Am I affected by CVE-2026-59305?** Check whether you run VMware Spring Cloud Stream at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A partition interceptor may be improperly added during message sending operations in Spring Cloud Stream, affecting versions 4.2.0–4.2.6, 4.3.0–4.3.3, and 5.0.0–5.0.2. The vulnerability is rooted in incorrect interceptor lifecycle management when partitioning messages for distribution across broker partitions. While the attack vector and exploitation complexity are not fully detailed in the advisory, the low CVSS score (3.1) suggests limited practical impact, likely requiring specific application configurations or conditions to trigger. Patches are available in newer versions beyond those listed.

## Affected products

- VMware Spring Cloud Stream 4.2.0–4.2.6, 4.3.0–4.3.3, 5.0.0–5.0.2

## Timeline

- 2026-08-27: disclosed

## References

- [https://spring.io/security/cve-2026-59305](https://spring.io/security/cve-2026-59305)

## Related threats

- [VMware Spring Cloud Stream improper content type caching in Avro](https://junglewise.ai/threats/cve-2026-59304-vmware-spring-cloud-stream-improper-content-type-caching-in-avro)
- [Spring Cloud Stream information disclosure via logging](https://junglewise.ai/threats/cve-2026-59302-spring-cloud-stream-information-disclosure-via-logging)