How severe is CVE-2026-49361?

CVE-2026-49361 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-49361 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-49361?

CVE-2026-49361 affects Apache Fluss. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-49361?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-49361 have an EU (EUVD) identifier?

Yes. CVE-2026-49361 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33600.

When was CVE-2026-49361 published?

CVE-2026-49361 was published on 2026-06-01 and last updated on 2026-06-17.

CVE-2026-49361

CVE-2026-49361 is a high-severity vulnerability in Apache Fluss with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-400.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (44th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-33600
Weakness: CWE-400
Affected product: Apache Fluss
Published: 2026-06-01
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-49361?: 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.
How severe is CVE-2026-49361?: CVE-2026-49361 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-49361 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-49361?: CVE-2026-49361 affects Apache Fluss. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-49361?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-49361 have an EU (EUVD) identifier?: Yes. CVE-2026-49361 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33600.
When was CVE-2026-49361 published?: CVE-2026-49361 was published on 2026-06-01 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:apache:fluss:*:*:*:*:*:*:*:*

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