CVE-2026-49361

High

Description

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.

SeverityHigh

CVSS7.5

Exploit probability—

Product

Apache Fluss

PublishedJun 1, 2026

First seenJun 1, 2026

Weakness typeCWE-770Allocation of resources without limits CWE-400Uncontrolled resource consumption

How to fix

Update

apache fluss0.9.1 or later
org.apache.fluss:fluss-common0.9.1-incubating or later

Vendor advisories

lists.apache.org/thread/dccw6tj0njwtmvbftq13mw7fdhsok373

Affected products

Product	Affected versions	Fixed in
apache fluss	0.8.0 ≤ v < 0.9.1	0.9.1
org.apache.fluss:fluss-commonMaven	0.8.0-incubating-rc1 ≤ v < 0.9.1-incubating	0.9.1-incubating

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