CVE-2025-27821

Severity CVSS v4.0:

Pending analysis

Type:

CWE-787 Out-of-bounds Write

Publication date:

26/01/2026

Last modified:

26/01/2026

Description

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

Impact

Vector 3.x

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L CVSS v3.1 Severity and Metrics:

Base Score: 7.30 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

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

Base Score 3.x

7.30

Severity 3.x

HIGH

References to Advisories, Solutions, and Tools

https://lists.apache.org/thread/kwjhyyx0wl2z9b0mw0styjk0hhdbyplh
http://www.openwall.com/lists/oss-security/2026/01/23/7