Improper Handling of Highly Compressed Data (Data Amplification) Affecting org.apache.kafka:kafka-clients package, versions [3.7.0,4.2.2)[4.3.0,4.3.1)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published3 Nov 2026
- disclosed28 Oct 2026
- creditDawit Jeong
Introduced: 28 Oct 2026
NewCVE-2026-111073 (opens in a new tab)How to fix?
Upgrade org.apache.kafka:kafka-clients to version 4.2.2, 4.3.1 or higher.
Overview
org.apache.kafka:kafka-clients is a streaming platform that can publish and subscribe to streams of records, store streams of records in a fault-tolerant durable way, and process streams of records as they occur.
Affected versions of this package are vulnerable to Improper Handling of Highly Compressed Data (Data Amplification) via the decompress function in ClientTelemetryUtils during broker-side PushTelemetry processing. An authenticated client can exhaust broker heap by sending a small, highly compressible metrics payload that passes the compressed-size limit but expands without a decompressed-size limit, causing an OutOfMemoryError that degrades or crashes the broker. PushTelemetry is not gated by an ACL, and repeated or concurrent requests can affect cluster availability.
Notes
- The compressed input is capped by
telemetry.max.bytes(default 1 MB); lowering it reduces the worst-case expansion proportionally, but does not prevent the amplification.
Workarounds
- Lower
telemetry.max.byteson affected brokers to reduce the worst-case decompressed payload size and resulting heap consumption; this is only a partial mitigation.