What is CVE-2026-49361?

CVE-2026-49361 is a high-severity vulnerability in Apache Fluss, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-06-01.

How severe is CVE-2026-49361?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Apache Fluss

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.

Vulnerability class: DoS (Denial of Service)

Published 2026-06-01 · last modified 2026-07-22.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.009 (58.0th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 58.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.009 · change: +0.003

Affected products

Apache Fluss
Apache Software Foundation Fluss (Incubating) — versions 0.8.0, 0.9.0

Weakness classification (CWE)

References

lists.apache.org/thread/dccw6tj0njwtmvbftq13mw7fdhsok373 (vendor-advisory, Mailing List, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-49361?: CVE-2026-49361 is a high-severity vulnerability in Apache Fluss, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-06-01.
How severe is CVE-2026-49361?: High severity. CVSS v3 base score is 7.5 out of 10.