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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.

Quick assessment

Affected
Apache Software Foundation Apache Kafka
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Apache Kafka 的 FetchSnapshot RPC 处理程序中，存在一个不正确的运算符（CWE-480）漏洞。该漏洞影响 2.8.0 至 4.2.2 之前的版本，以及 4.3.0 至 4.3.2 之前的版本，且存在于所有平台上。拥有 CLUSTER_ACTION 权限的已认证攻击者可通过构造一个包含空主题数组（topics array）或包含无分区主题的 FetchSnapshotRequest，引发拒绝服务攻击，导致控制器进程终止。 建议用户升级至 4.2.2、4.3.2 或 4.4.0 版本以

AI Predicted 6.5 Difficulty: Easy

Possible ATT&CK Techniques 1 AI

T1499.003 · Application Exhaustion Flood
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I. Basic Information for CVE-2026-83525

Vulnerability Information
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Vulnerability Title
Apache Kafka: Incorrect boolean operator in FetchSnapshot RPC handler allows authenticated network clients to crash the KRaft controller via a malformed request.
Source: CVE Program / CVE List V5
Vulnerability Description
Incorrect operator (CWE-480) in the FetchSnapshot RPC handler in Apache Kafka from 2.8.0 before 4.2.2, and from 4.3.0 before 4.3.2 on all platforms allows an authenticated attacker with CLUSTER_ACTION privilege to cause a denial of service (controller process termination) via a crafted FetchSnapshotRequest with an empty topics array or a topic with no partitions. Users are recommended to upgrade to version 4.2.2, 4.3.2, or 4.4.0, which fix this issue. Users on unsupported branches (4.1.x and earlier) should upgrade to 4.2.2 or later.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
使用操作符不正确
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache Kafka 2.8.0 ~ 4.2.2 -

II. Public POCs for CVE-2026-83525

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III. Intelligence Information for CVE-2026-83525

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Other References for CVE-2026-83525 (1)

Same Patch Batch · Apache Software Foundation · 2026-10-28 · 12 CVEs total

CVE-2026-114349 Apache Kafka: Denial of service via unbounded memory allocation when decoding compressed r
CVE-2026-112375 Apache Kafka: Unauthorized principal can read arbitrary broker files via IncrementalAlterC
CVE-2026-116593 Apache Kafka: Kafka Connect configuration provider values exposed via validation REST API
CVE-2026-115644 Apache Kafka: Connect Admin REST API Authentication Bypass via Unapplied REST Extensions
CVE-2026-111551 Apache Kafka: Denial of service in Kafka Streams and client deserializers via unbounded me
CVE-2026-111496 Apache Kafka: Kafka Streams StreamThread hang from integer overflow in stream-time punctua
CVE-2026-111115 Apache Kafka: Broker OutOfMemoryError via tagged-field allocation amplification in flexibl
CVE-2026-111108 Apache Kafka: Broker OutOfMemoryError via array allocation amplification in code-generated
CVE-2026-111073 Apache Kafka: PushTelemetry (KIP-714) metrics payloads are decompressed without a size lim
CVE-2026-110985 Apache Kafka: Broker silently skips JWT signature verification for SASL/OAUTHBEARER when t
CVE-2026-110952 Apache Kafka: Broker does not enforce JWT issuer and audience validation for SASL/OAUTHBEA

IV. Related Vulnerabilities

Same product: Apache Kafka
Same vendor: Apache Software Foundation
Same weakness: CWE-480