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Apache Hadoop Vulnerability Exposes Systems Potential Crashes or Data Corruption

## Cybersecurity: Apache Hadoop Vulnerability

JBy Julia KramerJan 26, 20261 min read

Cybersecurity: Apache Hadoop Vulnerability

A moderate-severity vulnerability has been identified in the Hadoop Distributed File System (HDFS) native client. This issue, tracked as CVE-2025-27821, allows attackers to trigger system crashes or compromise data integrity through malicious URI inputs.

The vulnerability affects Apache Hadoop versions 3.2.0 through 3.4.1, stemming from an out-of-bounds write flaw in the URI parser of the HDFS native client. This flaw allows data to be written beyond allocated memory boundaries, potentially causing application crashes, denial-of-service (DoS) attacks, or data corruption.

CVE ID Severity Affected Versions Component

CVE-2025-27821 Moderate 3.2.0 – 3.4.1 HDFS Native Client

A moderate-severity vulnerability has been identified in the Hadoop Distributed File System (HDFS) native client.
Julia Kramer · Thehackingpost

Exploitation of this vulnerability through improper bounds checking in URI parsing can lead to unpredictable system behavior, including possible service disruptions and data integrity issues.

The vulnerability impacts all Apache Hadoop deployments using the hadoop-hdfs-native-client component in versions 3.2.0 through 3.4.1. Apache has released Hadoop version 3.4.2, which includes patches addressing the URI parsing flaw.

Organizations are advised to upgrade to version 3.4.2 immediately to mitigate the risk. System administrators should prioritize patching HDFS native client installations, especially in environments handling sensitive data or critical workloads.

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For organizations unable to patch immediately, implementing network-level controls to restrict URI inputs is recommended. Monitoring HDFS client logs for unusual parsing errors or crashes can also temporarily reduce risk until the upgrade is completed.

The details of this vulnerability adhere to Apache's standard disclosure procedures and can be found in the official Apache Hadoop security advisory and CVE database.

Based on reporting by Cyber Security News.

AI transparency. This article was produced with the assistance of artificial intelligence and published under human editorial oversight. AI systems can make mistakes. Read how we use AI (EU AI Act, Art. 50).
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