Kafka FetchSnapshot bug lets privileged clients crash KRaft (CVE-2026-83525)
Original title: CVE-2026-83525: Apache Kafka: Incorrect boolean operator in FetchSnapshot RPC handler allows authenticated network clients to crash the KRaft controller via a malformed request.
Authenticated clients with CLUSTER_ACTION can terminate the controller using an empty-topics FetchSnapshotRequest.
Apache rates CVE-2026-83525 low. An incorrect boolean operator (CWE-480) in the FetchSnapshot RPC handler lets an authenticated attacker with CLUSTER_ACTION crash the KRaft controller by sending a crafted FetchSnapshotRequest with empty topics. Affected releases are Kafka 2.8.0 before 4.2.2 and 4.3.0 before 4.3.2 on all platforms. The listing does not mention exploitation.
Unconfirmed: The feed snippet ends mid-sentence and does not state whether attacks are known.
- Posted by Manikumar on October 28 and rated low.
- The flaw is an incorrect operator in the FetchSnapshot handler.
- A crafted request with empty topics terminates the controller process.
- The issue applies on all platforms.
Impact: Denial of service by terminating the KRaft controller
| Product | Affected | Fixed in |
|---|---|---|
| Apache Kafka | 2.8.0 before 4.2.2; 4.3.0 before 4.3.2 | 4.2.2 and 4.3.2 |
- 1.Upgrade Apache Kafka to 4.2.2 or 4.3.2.
Vulnerabilities mentioned
All| CVE | Vulnerability | CVSS | EPSS | Signals | Published |
|---|---|---|---|---|---|
| CVE-2026-83525 | Incorrect operator DoS in Apache Kafka FetchSnapshot | — | — |
From the original article
Posted by Manikumar on Oct 28 Severity: low Affected versions: - Apache Kafka 2. 8. 0 before 4.
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