---
id: "CVE-2026-108771"
kind: "vulnerability"
aliases: ["CVE-2026-108771"]
title: "Apache Kylin: unauthenticated broadcast flaw enables unsafe deserialization on exposed servers"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["apache-kylin", "java", "package", "self-hosted"]
not_affected_if: ["private-network-only", "versions-outside-4.0.0-5.0.4"]
published_at: "2026-10-19T10:16:44+00:00"
first_seen_at: "2026-10-23T21:57:17+00:00"
updated_at: "2026-10-25T05:12:40+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-108771", "first_seen_at": "2026-10-23T21:57:17+00:00"}]
---

# Apache Kylin: unauthenticated broadcast flaw enables unsafe deserialization on exposed servers

Apache Kylin 4.0.0 through 5.0.4 has a missing authentication check on an internal broadcast endpoint combined with polymorphic deserialization. An attacker who can reach a Kylin service directly from the public internet may be able to trigger unsafe object deserialization.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed Kylin version and whether it falls in `4.0.0` through `5.0.4`
- Confirm whether Kylin services are reachable from the public network, for example on the Kylin web or service port

## Fix

- Upgrade Apache Kylin to `5.0.5`

## Timeline

- 2026-10-23T21:57:17+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-108771

## From the sources

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.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_