CVE-2025-27821
HDFS native client: Out of bounds write in URI parser of native HDFS client
HIGH
7.3
CVSS Score
Published: January 26, 2026 at 09:44 AM UTC
Updated: June 17, 2026 at 09:04 AM UTC
1 product affected across 1 vendorHadoop
Using HDFS native client by Apache Software Foundation?
Get instant alerts when new vulnerabilities affect HDFS native client - before attackers find them.
Real-time alertsTrack your software stackFree plan available
Severity
HIGH7.3
Exploit prediction
EPSS 0.9%
SSVC
No known exploit
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.
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (2)
Vendor AdvisoryMailing List
Source: cverecord
https://lists.apache.org/thread/kwjhyyx0wl2z9b0mw0styjk0hhdbyplhMailing ListThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
http://www.openwall.com/lists/oss-security/2026/01/23/7SSVC — Action Prioritization
SSVCNo known exploitAutomatablePartial impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
7.3HIGHCISA-ADP
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- LOW
- Integrity
- LOW
- Availability
- LOW
Vector?
Quick Info
StatusANALYZED
CWE
CWE-787
Get alerted
Stop reading CVE feeds looking for your own stack
Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.
Free plan, no card