CVE-2026-41855 Spring Framework Unsafe Deserialization via Jackson JMS Converters
Attackers can execute arbitrary code via unsafe deserialization in Spring JMS converters when processing untrusted messages.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-41855?
CVE-2026-41855 is a high-severity unsafe deserialization vulnerability in Vmware Spring Framework, published on 9 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In an untrusted JMS environment, org.springframework.jms.support.converter.MappingJackson2MessageConverter and org.springframework.jms.support.converter.JacksonJsonMessageConverter allow arbitrary class instantiation, which can lead to unauthorized actions via gadget class deserialization.
Affected versions: Spring Framework 7.0.0 through 7.0.7; 6.2.0 through 6.2.18; 6.1.0 through 6.1.27; 5.3.0 through 5.3.48.
Weakness: CWE-502
Which versions are affected by CVE-2026-41855?
8 open source packages ship an affected version, including org.springframework:spring-jms. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.springframework:spring-jms Maven | All versions to 5.3.39 | None |
org.springframework:spring-jms Maven | All versions to 5.3.39 | None |
org.springframework:spring-jms Maven | From 6.0.0 to 6.1.21 | None |
org.springframework:spring-jms Maven | From 6.0.0 to 6.1.21 | None |
org.springframework:spring-jms Maven | From 6.2.0 | 6.2.19 |
org.springframework:spring-jms Maven | From 6.2.0 | 6.2.19 |
2 more packages
org.springframework:spring-jms Maven | From 7.0.0-M1 | 7.0.8 |
org.springframework:spring-jms Maven | From 7.0.0-M1 | 7.0.8 |
Products include Vmware Spring Framework.
How do I fix CVE-2026-41855?
Upgrade org.springframework:spring-jms to a fixed version for your release line: 6.2.19 or 7.0.8.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-41855 being exploited?
There is no known exploitation of CVE-2026-41855 in the wild and no public exploit code.
Other vulnerabilities in Vmware Spring Framework
- CVE-2026-47884 Spring Framework Improper Path Limitation in XsltView
- CVE-2026-47890 Spring Framework Server Sent Event stream corruption while rendering fragments
- CVE-2026-47891 Spring Framework maxInMemorySize Bypassed in Jaxb2Decoder
- CVE-2026-47892 Spring Framework Header Predicate Bypass in WebFlux Functional Endpoints
- CVE-2026-59313 Server Sent Event stream corruption in Spring MVC functional web framework
Sources
Also known as CLEANSTART-2026-PK17424, CLEANSTART-2026-QF25549, CLEANSTART-2026-XA59472, CLSA-2026-1783040456, CLSA-2026-1787563066, CLSA-2026-1787749852 and 16 more.