CVE-2026-49361: Apache Fluss: Unauthenticated remote attackers can exhaust JVM heap memory using crafted frame headers via TabletServer/CoordinatorServer

June 1, 2026 (updated July 8, 2026)

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.

References

github.com/advisories/GHSA-4c39-fwgj-4vq7
github.com/apache/fluss/releases/tag/v0.9.1-incubating
lists.apache.org/thread/dccw6tj0njwtmvbftq13mw7fdhsok373
nvd.nist.gov/vuln/detail/CVE-2026-49361

Code Behaviors & Features

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