CVE-2026-49361: Apache Fluss Unauthenticated Remote Attackers Can Exhaust Vulnerability

HIGH
Advisory Identifier: GHSA-4c39-fwgj-4vq7
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CVSS 7.5
CWE-400
Published
Advisory Summary

CVE-2026-49361 is a HIGH (CVSS 7.5) unauthenticated remote attackers can exhaust vulnerability (CWE-400: Uncontrolled Resource Consumption) affecting Apache Fluss libraries in the Maven ecosystem. The issue involves unauthenticated remote attackers can exhaust jvm heap memory using crafted frame headers via tabletserver/coordinatorserver. Remediation is available by upgrading affected packages to version 0.9.1-incubating.

CVE-2026-49361 at a Glance

CVE Identifier CVE-2026-49361
GHSA Identifier GHSA-4c39-fwgj-4vq7
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-400: Uncontrolled Resource Consumption
Affected Product Apache Fluss
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2026-49361

To remediate this vulnerability, upgrade all affected Apache Fluss dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

org.apache.fluss:fluss-common fixed: 0.9.1-incubating 
<dependency>
    <groupId>org.apache.fluss</groupId>
    <artifactId>fluss-common</artifactId>
    <version>0.9.1-incubating</version>
</dependency>
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree -Dincludes=org.apache.fluss

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-49361, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.apache.fluss

Analyze the terminal output to locate any version of Apache Fluss in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.9.1-incubating), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.apache.fluss command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-400: Uncontrolled Resource Consumption, where the product does not properly control the allocation and maintenance of a limited resource. In Apache Fluss, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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.

CVE-2026-49361 Affected Apache Fluss Versions

1 component(s)
Fixed Versions:
0.9.1-incubating
Product / Package Ecosystem Affected Versions Fixed Version
org.apache.fluss:fluss-common
maven/org.apache.fluss/fluss-common
Maven
≥ 0.8.0-incubating-rc1
< 0.9.1-incubating
0.9.1-incubating

References

NVD — CVE-2026-49361 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-49361
Apache Fluss Source Repository REPOSITORY
https://github.com/apache/fluss
Apache Fluss Release RELEASE
https://github.com/apache/fluss/releases/tag/v0.9.1-incubating
lists.apache.org/thread/dccw6tj0njwt... WEB
https://lists.apache.org/thread/dccw6tj0njwtmvbftq13mw7fdhsok373
Apache Fluss Security Information SECURITY
http://www.openwall.com/lists/oss-security/2026/05/30/5

Frequently Asked Questions

What is CVE-2026-49361?
CVE-2026-49361 is a security vulnerability in Apache Fluss involving Unauthenticated remote attackers can exhaust JVM heap memory using crafted frame headers via TabletServer/CoordinatorServer under CWE-400: Uncontrolled Resource Consumption.
Which Apache Fluss versions are affected?
Affected versions include releases prior to 0.9.1-incubating across affected packages: org.apache.fluss:fluss-common.
What version fixes CVE-2026-49361?
Upgrading to 0.9.1-incubating (or the latest patched release for your respective branch) resolves the vulnerability.
Is fluss-common affected?
Yes, org.apache.fluss:fluss-common is affected in releases prior to 0.9.1-incubating. Upgrade your dependency to 0.9.1-incubating or later.
What is the CVSS score of CVE-2026-49361?
CVE-2026-49361 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2026-49361?
CVE-2026-49361 is classified under CWE-400: Uncontrolled Resource Consumption (The product does not properly control the allocation and maintenance of a limited resource.).
How can I check Maven dependencies for CVE-2026-49361?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.apache.fluss'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-4c39-fwgj-4vq7",
  "modified" : "2026-07-08T19:44:03Z",
  "published" : "2026-06-01T09:31:15Z",
  "aliases" : [ "CVE-2026-49361" ],
  "summary" : "Apache Fluss: Unauthenticated remote attackers can exhaust JVM heap memory using crafted frame headers via TabletServer/CoordinatorServer",
  "details" : "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.\n\nThis issue affects Apache Fluss (incubating): 0.8.0 and 0.9.0.\n\nUsers are recommended to upgrade to version 0.9.1, which fixes the issue.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.apache.fluss:fluss-common"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0.8.0-incubating-rc1"
      }, {
        "fixed" : "0.9.1-incubating"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-49361"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/apache/fluss"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/apache/fluss/releases/tag/v0.9.1-incubating"
  }, {
    "type" : "WEB",
    "url" : "https://lists.apache.org/thread/dccw6tj0njwtmvbftq13mw7fdhsok373"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2026/05/30/5"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-400" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-08T19:44:03Z",
    "nvd_published_at" : "2026-06-01T09:16:20Z"
  }
}