In Spring for Apache Kafka, unbounded delegate cache keyed on user-controlled, potentially malicious selector header
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.
01
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-41726US | — | — | ||
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.selecto… | ||||
02
references
External citations — patches, advisories, analysis.
- https://github.com/spring-projects/spring-kafkaPACKAGE
- https://github.com/spring-projects/spring-kafka/commit/ca2337ba789c5778a10197bda17a62915247ff6cWEB
- https://github.com/spring-projects/spring-kafka/issues/4489WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-41726ADVISORY
- https://spring.io/security/cve-2026-41726WEB
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