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CVE-2025-27821

HDFS native client: Out of bounds write in URI parser of native HDFS client

Published: Jan 26, 2026Updated: Jan 27, 2026 Sources: CVE List NVD GHSACWE-787
NVD MITRE
7.3CVSSHIGH
EPSS Score
0.8%
Top 48.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:LI:LA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:LAvailability
Low
Open in CVSS calculator →

Weaknesses

CWE-787

Affected Products

hadoopapache
On-premDatabase
Databases / data-warehouse-analytics
org.apache.hadoop:hadoop-hdfs-native-clientMavenOSS Libraries
HDFS native clientApache Software Foundation
Mixed
Web & CMS Plugins / cms-core
apacheoss-projectUSWeb & CMS Pluginsaka apache http server, apache httpd
mavenpackage-ecosystemOSS Libraries
apache software foundationoss-projectUSWeb & CMS Pluginsaka apache foundation

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://lists.apache.org/thread/kwjhyyx0wl2z9b0mw0styjk0hhdbyplh
lists.apache.org
http://www.openwall.com/lists/oss-security/2026/01/23/7
openwall.com
https://nvd.nist.gov/vuln/detail/CVE-2025-27821
nvd.nist.gov
and 4 more references View all →

Timeline

Published
Jan 26, 2026
Last Updated
Jan 27, 2026

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