In Spring for Apache Kafka, unbounded delegate cache keyed on user-controlled, potentially malicious selector header
CVE-2026-41726

6.5MEDIUM

Key Information:

Vendor

Spring

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

What is CVE-2026-41726?

When an application opts into DelegatingDeserializer, a producer can grow the consumer's heap without bound by sending records with unique random spring.kafka.serialization.selector header values, eventually causing GC thrash and OutOfMemoryError.

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-2026-41726

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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