Deserialization in Spring Framework
CVE-2026-41855
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.
Vulnerability class: Insecure Deserialization
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (39.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 39.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002
Affected products
- Spring Framework — versions 7.0.0, 6.2.0, 6.1.0
- VMware Spring Framework
Weakness classification (CWE)
References
- spring.io/security/cve-2026-41855 (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-41855?
- CVE-2026-41855 is a high-severity vulnerability in Spring Framework, classified under Deserialization of Untrusted Data. CVSS score: 8.1/10. Published 2026-06-09.
- How severe is CVE-2026-41855?
- High severity. CVSS v3 base score is 8.1 out of 10.