Critical severity · published Jun 9, 2026
CVE-2026-41855
Spring Framework Unsafe Deserialization via Jackson JMS Converters
9.8
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 26% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SF
Spring Framework · Spring
7.0.0 before 7.0.7.1; 6.2.0 before 6.2.18.1; 6.1.0 before 6.1.28; 5.3.0 before 5.3.49 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-41855
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-41855
Vendor Advisory
https://spring.io/security/cve-2026-41855
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