CVE-2025-27821

Published Jan 26, 2026

Last updated 3 months ago

Overview

AI description

Automated description summarized from trusted sources.

CVE-2025-27821 describes an out-of-bounds write vulnerability found in the Apache Hadoop HDFS native client. This flaw specifically resides within the URI parser component of the client. It affects Apache Hadoop versions 3.2.0 through 3.4.1. The vulnerability allows for data to be written beyond the intended memory boundaries when the HDFS native client processes specially crafted Uniform Resource Identifiers (URIs). This memory corruption can lead to unpredictable system behavior, including application crashes or data corruption. The issue was reported by security researcher BUI Ngoc Tan, and Apache has addressed it in version 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.
Source: security@apache.org
NVD status: Analyzed
Products: hadoop

Risk scores

CVSS 3.1

Type: Secondary
Base score: 7.3
Impact score: 3.4
Exploitability score: 3.9
Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Severity: HIGH

Weaknesses

security@apache.org: CWE-787

Hype score: Not currently trending

Configurations

[
  {
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:apache:hadoop:*:*:*:*:*:*:*:*",
            "matchCriteriaId": "4EED8AAC-78E8-4337-97C1-7C8AAB2E7376",
            "versionEndExcluding": "3.4.2",
            "versionStartIncluding": "3.2.0",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ]
  }
]

Apache Hadoop’s RunJar.run() does not set permissions for temporary directory by default. If sensitive data will be present in this file, all the other local users may be able to view the content. This is because, on unix-like systems, the system temporary directory is shared between all local users. As such, files written in this directory, without setting the correct posix permissions explicitly, may be viewable by all other local users.•CVE-2024-23454

References

Sources include official advisories and independent security research.