High severity · published Jun 9, 2026
CVE-2026-41731
In Spring for Apache Kafka, overly broad trusted-package matching in header mappers exposes JDK classes to deserialization
8.1
CVSS
0.5%
EPSS
No
On KEV
Description
JsonKafkaHeaderMapper and the deprecated DefaultKafkaHeaderMapper matched type headers against trusted packages using a prefix check, meaning that trusting any package implicitly trusted all of its subpackages. Combined with Jackson's default bean deserialization, a producer could supply crafted header values that caused the consumer to deserialize arbitrary JDK types.
Affected versions:
Spring for Apache Kafka 4.0.0 through 4.0.5; 3.3.0 through 3.3.15; 3.2.0 through 3.2.13; 2.9.0 through 2.9.13; 2.8.0 through 2.8.11.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 43% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SF
Spring for Apache Kafka · Spring
4.0.0 before 4.0.5.1; 3.3.0 before 3.3.15.1; 3.2.0 before 3.2.14; 2.9.0 before 2.9.14; 2.8.0 before 2.8.12 · source: vendor, NVD
FU
Fuse · Redhat
7.0.0 · source: NVD
JE
Jboss Enterprise Application Platform Expansion Pack · Redhat
All versions, or not specified · source: NVD
RH
Red Hat Fuse 7 · Red Hat
All versions, or not specified · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-41731
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-41731
Vendor Advisory
https://spring.io/security/cve-2026-41731
Third Party Advisory
https://access.redhat.com/security/cve/CVE-2026-41731
Issue Tracking
https://bugzilla.redhat.com/show_bug.cgi?id=2487375
Third Party Advisory
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-41731.json
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