What is CVE-2026-49361?

CVE-2026-49361 is a high-severity uncontrolled resource consumption vulnerability in org.apache.fluss:fluss-common (maven), affecting versions >= 0.8.0-incubating-rc1, < 0.9.1-incubating. It is fixed in 0.9.1-incubating. Crafted input forces the application to consume excessive CPU, memory, or other resources, degrading or denying service.

How severe is CVE-2026-49361?

CVE-2026-49361 has a CVSS score of 7.5 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.

Which versions of org.apache.fluss:fluss-common are affected by CVE-2026-49361?

org.apache.fluss:fluss-common (maven) versions >= 0.8.0-incubating-rc1, < 0.9.1-incubating is affected.

Is there a fix for CVE-2026-49361?

Yes. CVE-2026-49361 is fixed in 0.9.1-incubating. Upgrade to this version or later.

Is CVE-2026-49361 exploitable, and should I be worried?

Whether CVE-2026-49361 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk.

What actually determines whether CVE-2026-49361 is exploitable, and how bad it is?

Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.

CVE-2026-49361 in org.apache.fluss:fluss-common

Q: How severe is CVE-2026-49361?

CVE-2026-49361 has a CVSS score of 7.5 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.

Q: Which versions of org.apache.fluss:fluss-common are affected by CVE-2026-49361?

org.apache.fluss:fluss-common (maven) versions >= 0.8.0-incubating-rc1, < 0.9.1-incubating is affected.

Q: Is there a fix for CVE-2026-49361?

Yes. CVE-2026-49361 is fixed in 0.9.1-incubating. Upgrade to this version or later.

Q: Is CVE-2026-49361 exploitable, and should I be worried?

Whether CVE-2026-49361 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk.

Q: What actually determines whether CVE-2026-49361 is exploitable, and how bad it is?

Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.

Q: How do I fix CVE-2026-49361?

Upgrade org.apache.fluss:fluss-common to 0.9.1-incubating or later.

Summary

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

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.

Impact

Crafted input forces the application to consume excessive CPU, memory, or other resources, degrading or denying service. Typical impact: denial of service.

CVE-2026-49361 has a CVSS score of 7.5 (High). The vector is network-reachable, no privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (0.9.1-incubating); upgrading removes the vulnerable code path.

Affected versions

org.apache.fluss:fluss-common (>= 0.8.0-incubating-rc1, < 0.9.1-incubating)

Security releases

org.apache.fluss:fluss-common → 0.9.1-incubating (maven)

Kodem intelligence

Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.

Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.

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Remediation advice

Upgrade org.apache.fluss:fluss-common to 0.9.1-incubating or later to resolve this vulnerability.

Kodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.

Frequently Asked Questions

What is CVE-2026-49361? CVE-2026-49361 is a high-severity uncontrolled resource consumption vulnerability in org.apache.fluss:fluss-common (maven), affecting versions >= 0.8.0-incubating-rc1, < 0.9.1-incubating. It is fixed in 0.9.1-incubating. Crafted input forces the application to consume excessive CPU, memory, or other resources, degrading or denying service.
How severe is CVE-2026-49361? CVE-2026-49361 has a CVSS score of 7.5 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
Which versions of org.apache.fluss:fluss-common are affected by CVE-2026-49361? org.apache.fluss:fluss-common (maven) versions >= 0.8.0-incubating-rc1, < 0.9.1-incubating is affected.
Is there a fix for CVE-2026-49361? Yes. CVE-2026-49361 is fixed in 0.9.1-incubating. Upgrade to this version or later.
Is CVE-2026-49361 exploitable, and should I be worried? Whether CVE-2026-49361 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
What actually determines whether CVE-2026-49361 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
How do I fix CVE-2026-49361? Upgrade org.apache.fluss:fluss-common to 0.9.1-incubating or later.