CVE-2026-41726

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

State: Published
Severity: 6.5 Medium
Published: Jun 9, 2026
Updated: Jun 27, 2026
Reserved: Apr 22, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	vmware

Weaknesses

CWE-770 Allocation of Resources Without Limits or Throttling

Affected Products

Product	Versions
Spring for Apache KafkaSpring	4.0.0 to before 4.0.5.1Affected 3.3.0 to before 3.3.15.1Affected 3.2.0 to before 3.2.14Affected 2.9.0 to before 2.9.14Affected 2.8.0 to before 2.8.12Affected

References

https://spring.io/security/cve-2026-41726

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