CVE-2026-59304 Improper caching of the original content type in Spring Cloud Stream Avro

Low 3.1 Published 27 Aug 2026 Updated 28 Aug 2026

Improper caching of content type in Spring Cloud Stream Avro may lead to type confusion issues.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2026-59304?

CVE-2026-59304 is a low-severity vulnerability in Spring Cloud Stream, published on 27 Aug 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

Official description

Improper caching of the original content type in Spring Cloud Stream Avro. Spring Cloud Stream 5.0.0 - 5.0.2 Spring Cloud Stream 4.3.0 - 4.3.3 Spring Cloud Stream 4.2.0 - 4.2.6

Weakness: CWE-843

Which versions are affected by CVE-2026-59304?

It affects 1 product.

Products include Vmware Spring Cloud Stream.

How do I fix CVE-2026-59304?

No fix has been published for CVE-2026-59304 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-59304 being exploited?

There is no known exploitation of CVE-2026-59304 in the wild and no public exploit code.

Sources

Also known as GHSA-jjqx-2h5c-j956.