In Spring for Apache Kafka, overly broad trusted-package matching in header mappers exposes JDK classes to deserialization
CVE-2026-41731

8.1HIGH

Key Information:

Vendor

Spring

Status
Spring For Apache Kafka
Vendor
CVE Published:
9 June 2026

What is CVE-2026-41731?

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.

Affected Version(s)

Spring for Apache Kafka 4.0.0 < 4.0.6

Spring for Apache Kafka 3.3.0 < 3.3.16

Spring for Apache Kafka 3.2.0 < 3.2.14

References

https://spring.io/security/cve-2026-41731

CVSS V3.1

Score:
8.1
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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