CVE-2026-59306 Potential for deserialization of untrusted types in Spring Cloud Stream
Attackers can execute arbitrary code by sending malicious serialized data to applications using Spring Cloud Stream.
- 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
- Available
What is CVE-2026-59306?
CVE-2026-59306 is a low-severity unsafe deserialization 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
Potential for deserialization of untrusted types in Spring Cloud Stream. 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-502
Which versions are affected by CVE-2026-59306?
It affects 1 product.
Products include Vmware Spring Cloud Stream.
How do I fix CVE-2026-59306?
Upgrade to a fixed version.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-59306 being exploited?
There is no known exploitation of CVE-2026-59306 in the wild and no public exploit code.
Other vulnerabilities in Spring Cloud Stream
Sources
Also known as GHSA-j34j-5m9r-p984.