---
id: "CVE-2026-64610"
kind: "vulnerability"
aliases: ["CVE-2026-64610"]
title: "Deserialization of Untrusted Data vulnerability in Apache Kylin"
severity: "critical"
cvss: 9.8
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["apache-kylin", "java", "package", "self-hosted"]
not_affected_if: ["default-config"]
published_at: "2026-10-16T13:16:57+00:00"
first_seen_at: "2026-10-23T21:57:13+00:00"
updated_at: "2026-10-23T22:28:55+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64610", "first_seen_at": "2026-10-23T21:57:13+00:00"}]
---

# Deserialization of Untrusted Data vulnerability in Apache Kylin

Apache Kylin versions 4 through 5.0.4 deserialize untrusted Java objects from an external cache service. An attacker who can make the cache service return crafted data can run code on the Kylin server.

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

## How to check

Check the deployed Kylin version in the installed package or release files; affected if it is 4.x through 5.0.4.
If an external cache service is configured for Kylin, note its host and who can write to it.

## Fix

Upgrade Apache Kylin to version 5.0.5.
Until then, restrict who can write to the external cache service (unknown whether this is a complete mitigation).

## Timeline

- 2026-10-23T21:57:13+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-64610

## From the sources

Deserialization of Untrusted Data vulnerability in Apache Kylin. Unsafe Java deserialization could happen from a broken external cache service.



This issue affects Apache Kylin: from 4 through 5.0.4.



Users are recommended to upgrade to version 5.0.5, which fixes the issue.

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