Bug 2487380 (CVE-2026-41726)

Summary: CVE-2026-41726 spring-kafka: Spring-kafka: Denial of Service due to unbounded heap growth via unique header values
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: asoldano, bbaranow, bmaxwell, bstansbe, dlofthou, gmalinko, istudens, ivassile, iweiss, janstey, mosmerov, msvehla, nwallace, pdelbell, pesilva, pjindal, pmackay, rstancel, rstepani, thjenkin, vdosoudi
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in spring-kafka. When an application uses the DelegatingDeserializer, a malicious producer can exploit this vulnerability by sending records with unique, random `spring.kafka.serialization.selector` header values. This can cause the consumer's memory (heap) to grow without limits, leading to excessive garbage collection activity and eventually an OutOfMemoryError, resulting in a Denial of Service (DoS) for the application.
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Description OSIDB Bzimport 2026-06-10 00:02:00 UTC 
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.