CVE-2025-27821: Hadoop hdfs native client Apache Hadoop HDFS Native Client Vulnerability

HIGH
Advisory Identifier: GHSA-92cc-952p-v8rh
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CVSS 7.3
CWE-787
Published
Advisory Summary

CVE-2025-27821 is a HIGH (CVSS 7.3) apache hadoop hdfs native client vulnerability (CWE-787: Out-of-bounds Write) affecting Hadoop hdfs native client libraries in the Maven ecosystem. The issue involves apache hadoop hdfs native client has out-of-bounds write vulnerability. Remediation is available by upgrading affected packages to version 3.4.2.

CVE-2025-27821 at a Glance

CVE Identifier CVE-2025-27821
GHSA Identifier GHSA-92cc-952p-v8rh
Severity HIGH
CVSS v3.1 Base Score 7.3
CWE Classification CWE-787: Out-of-bounds Write
Affected Product Hadoop hdfs native client
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 7.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability Low (A:L)

How to Fix CVE-2025-27821

To remediate this vulnerability, upgrade all affected Hadoop hdfs native client dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

org.apache.hadoop:hadoop-hdfs-native-client fixed: 3.4.2 
<dependency>
    <groupId>org.apache.hadoop</groupId>
    <artifactId>hadoop-hdfs-native-client</artifactId>
    <version>3.4.2</version>
</dependency>
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree -Dincludes=org.apache.hadoop

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2025-27821, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.apache.hadoop

Analyze the terminal output to locate any version of Hadoop hdfs native client in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.4.2), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.apache.hadoop command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-787: Out-of-bounds Write, where the product writes data past the end, or before the beginning, of the intended buffer. In Hadoop hdfs native client, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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.

CVE-2025-27821 Affected Hadoop hdfs native client Versions

1 component(s)
Fixed Versions:
3.4.2
Product / Package Ecosystem Affected Versions Fixed Version
org.apache.hadoop:hadoop-hdfs-native-client
maven/org.apache.hadoop/hadoop-hdfs-native-client
Maven
≥ 3.2.0
< 3.4.2
3.4.2

References

NVD — CVE-2025-27821 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-27821
Hadoop hdfs native client Source Repository REPOSITORY
https://github.com/apache/hadoop/pull/7481
Security Fix Commit FIX COMMIT
https://github.com/apache/hadoop/commit/2b32e46f666c7645f5d1e026be3982b99319ccb8
Hadoop hdfs native client Source Repository REPOSITORY
https://github.com/apache/hadoop
issues.apache.org/jira/browse/hdfs-17... WEB
https://issues.apache.org/jira/browse/HDFS-17754
lists.apache.org/thread/kwjhyyx0wl2z... WEB
https://lists.apache.org/thread/kwjhyyx0wl2z9b0mw0styjk0hhdbyplh
Hadoop hdfs native client Security Information SECURITY
http://www.openwall.com/lists/oss-security/2026/01/23/7

Frequently Asked Questions

What is CVE-2025-27821?
CVE-2025-27821 is a security vulnerability in Hadoop hdfs native client involving Apache Hadoop HDFS Native Client has Out-of-bounds Write Vulnerability under CWE-787: Out-of-bounds Write.
Which Hadoop hdfs native client versions are affected?
Affected versions include releases prior to 3.4.2 across affected packages: org.apache.hadoop:hadoop-hdfs-native-client.
What version fixes CVE-2025-27821?
Upgrading to 3.4.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is hadoop-hdfs-native-client affected?
Yes, org.apache.hadoop:hadoop-hdfs-native-client is affected in releases prior to 3.4.2. Upgrade your dependency to 3.4.2 or later.
What is the CVSS score of CVE-2025-27821?
CVE-2025-27821 has a CVSS v3.1 base score of 7.3 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.
What CWE is associated with CVE-2025-27821?
CVE-2025-27821 is classified under CWE-787: Out-of-bounds Write (The product writes data past the end, or before the beginning, of the intended buffer.).
How can I check Maven dependencies for CVE-2025-27821?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.apache.hadoop'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-92cc-952p-v8rh",
  "modified" : "2026-01-26T23:40:20Z",
  "published" : "2026-01-26T12:30:27Z",
  "aliases" : [ "CVE-2025-27821" ],
  "summary" : "Apache Hadoop HDFS Native Client has Out-of-bounds Write Vulnerability ",
  "details" : "Out-of-bounds Write vulnerability in Apache Hadoop HDFS native client.\n\nThis issue affects Apache Hadoop: from 3.2.0 before 3.4.2.\n\nUsers are recommended to upgrade to version 3.4.2, which fixes the issue.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.apache.hadoop:hadoop-hdfs-native-client"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.2.0"
      }, {
        "fixed" : "3.4.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-27821"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/apache/hadoop/pull/7481"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/apache/hadoop/commit/2b32e46f666c7645f5d1e026be3982b99319ccb8"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/apache/hadoop"
  }, {
    "type" : "WEB",
    "url" : "https://issues.apache.org/jira/browse/HDFS-17754"
  }, {
    "type" : "WEB",
    "url" : "https://lists.apache.org/thread/kwjhyyx0wl2z9b0mw0styjk0hhdbyplh"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2026/01/23/7"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-787" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-01-26T23:40:20Z",
    "nvd_published_at" : "2026-01-26T10:16:05Z"
  }
}