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                            CERT-Renater

                Note d'Information No. 2026/VULN073
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DATE                : 26/01/2026

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running Apache Hadoop HDFS native client
                              versions prior to 3.4.2.

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https://lists.apache.org/thread/rscy33og020n7m61n4p3n7w9zdy7o4ly
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CVE-2025-27821: HDFS native client: Out of bounds write in URI parser
of native HDFS client


Severity: moderate 

Affected versions:

- HDFS native client (org.apache.hadoop:hadoop-hdfs-native-client)
3.2.0 before 3.4.2

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.

This issue is being tracked as HDFS-17754 

Credit:

BUI Ngoc Tan (reporter)

References:

https://hadoop.apache.org/
https://www.cve.org/CVERecord?id=CVE-2025-27821
https://issues.apache.org/jira/browse/HDFS-17754



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