CVE-2026-35554
race condition in the Apache Kafka Java producer client’s buffer pool management can cause…
Technology
Apache Kafka
CVSS Score
8.7 / 10.0
Affected Versions
>=2.8.0 <3.9.2; >=4.0.0 <4.0.2; >=4.1.0 <4.1.2
Upstream Fix
See upstream advisory
Published
April 7, 2026
OSSeva Coverage
Fixed upstream
Description
A race condition in the Apache Kafka Java producer client’s buffer pool management can cause messages to be silently delivered to incorrect topics. When a produce batch expires due to delivery.timeout.ms while a network request containing that batch is still in flight, the batch’s ByteBuffer is prematurely deallocated and returned to the buffer pool. If a subsequent producer batch—potentially destined for a different topic—reuses this freed buffer before the original network request completes, the buffer contents may become corrupted. This can result in messages being delivered to unintended topics without any error being reported to the prod
Is your Apache Kafka deployment affected?
If you're running >=2.8.0 <3.9.2; >=4.0.0 <4.0.2; >=4.1.0 <4.1.2, you need this patch. Book a discovery call to get covered.