Apache Fluss 0.9.1: Prevent DDOS via Netty frmDec MAX_LENGTH
CVE-2026-49361 Published on June 1, 2026
Apache Fluss Netty Frame Decoder Memory Exhaustion Vulnerability
Apache Fluss versions prior to 0.9.1 configure the Netty LengthFieldBasedFrameDecoder with Integer.MAX_VALUE as the maximum frame length, allowing unauthenticated remote attackers to exhaust JVM heap memory on TabletServer and CoordinatorServer by sending specially crafted frame headers, resulting in denial of service.
This issue affects Apache Fluss (incubating): 0.8.0 and 0.9.0.
Users are recommended to upgrade to version 0.9.1, which fixes the issue.
Weakness Types
Allocation of Resources Without Limits or Throttling
The software allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor.
What is a Resource Exhaustion Vulnerability?
The software does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.
CVE-2026-49361 has been classified to as a Resource Exhaustion vulnerability or weakness.
Affected Versions
Apache Software Foundation Apache Fluss (incubating):- Version 0.8.0 is affected.
- Version 0.9.0 is affected.