CVE-2026-108771: Apache Kylin: unauthenticated broadcast API and polymorphic deserialization

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-19 · updated 2026-10-30
Weakness: CWE-306

Description

Missing authentication for in-house broadcast and polymorphic deserialization vulnerability in Apache Kylin. Impact most to the kylin services that are directly exposed to public network, which is not common. In-house kylin deployments are mostly not impacted. This issue affects Apache Kylin: from 4.0.0 through 5.0.4. Users are recommended to upgrade to version 5.0.5, which fixes the issue.

Affected products

Apache Software Foundation Apache Kylin: from 4.0.0 through 5.0.4

References

https://lists.apache.org/thread.html/d77s7dh3bxf02l4rjbgb6807g605zskx
http://www.openwall.com/lists/oss-security/2026/10/16/16

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