CVE-2025-27821

High

Description

Out-of-bounds Write vulnerability in Apache Hadoop HDFS native client. This issue affects Apache Hadoop: from 3.2.0 before 3.4.2. Users are recommended to upgrade to version 3.4.2, which fixes the issue.

SeverityHigh

CVSS7.3

Exploit probability—

Product

Apache Hadoop

PublishedJan 26, 2026

First seenJan 26, 2026

Weakness typeCWE-787Out-of-bounds write

How to fix

Update

apache hadoop3.4.2 or later
org.apache.hadoop:hadoop-hdfs-native-client3.4.2 or later

Vendor advisories

lists.apache.org/thread/kwjhyyx0wl2z9b0mw0styjk0hhdbyplh

Affected products

Product	Affected versions	Fixed in
apache hadoop	3.2.0 ≤ v < 3.4.2	3.4.2
org.apache.hadoop:hadoop-hdfs-native-clientMaven	3.2.0 ≤ v < 3.4.2	3.4.2

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