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Fencer Vulns
high 8.1

CVE-2026-41855 json

Spring Framework Unsafe Deserialization via Jackson JMS Converters

published 2026-06-09 5 mo ago modified 2026-09-08 2 mo ago also GHSA-x863-p983-p4f7 , EUVD-2026-35344

cvss
8.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 26%
public exploits
0
none known

Summary

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.

Patch / fix

  • maven org.springframework:spring-jms 6.2.19, 7.0.8
  • Spring Spring Framework 5.3.49, 6.1.28, 6.2.18.1, 7.0.7.1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-41855 updated cvss 8.1

spring-jms: Spring Framework: Arbitrary code execution via deserialization in JMS message converters

  • Red Hat OpenShift Developer Tools and Services spring-jms 6.2.14 Red Hat OpenShift Dev Spaces spring-jms 6.2.14
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
5 mo ago

Exploit prediction

0.33% chance of exploitation in the next 30 days, higher than 26% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
GitHub 3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
maven org.springframework:spring-jms
<=5.3.39
>=6.0.0, <=6.1.21
>=6.2.0, <6.2.19
>=7.0.0-M1, <7.0.8
6.2.19
7.0.8

Affected products

  • Spring Spring Framework

Classification

Weakness
  • CWE-502 Deserialization of Untrusted Data
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.