Out-of-bounds Write Vulnerability in Apache Hadoop HDFS Native Client
CVE-2025-27821

7.3HIGH

Key Information:

Vendor

Apache
Status
Hdfs Native Client
Vendor
CVE Published:
26 January 2026

What is CVE-2025-27821?

An out-of-bounds write vulnerability has been identified in the native client of Apache Hadoop HDFS. This flaw allows attackers to manipulate or corrupt data beyond the intended memory boundaries, potentially leading to unexpected behavior or system instability. The issue affects Apache Hadoop versions beginning from 3.2.0 up to, but not including, 3.4.2. Users are strongly encouraged to upgrade to version 3.4.2 to mitigate this security risk and ensure the integrity and reliability of their data processing environments.

Affected Version(s)

HDFS native client 3.2.0 < 3.4.2

References

https://lists.apache.org/thread/kwjhyyx0wl2z9b0mw0styjk0h...
vendor-advisory

CVSS V3.1

Score:
7.3
Severity:
HIGH
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

BUI Ngoc Tan
.