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Vulnerability record · CVE-2025-27821 · published 26 January 2026

CVE-2025-27821: Apache hadoop out-of-bounds write vulnerability

Apache · Hadoop

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.

7.3 CVSS 3.1 High EPSS 0.96% · top 39.9% CWE-787 · Out-of-bounds write
7.3CVSS 3.1 base score
0.96%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://lists.apache.org/thread/kwjhyyx0wl2z9b0mw0styjk0hhdbyplh Mailing ListVendor Advisory
http://www.openwall.com/lists/oss-security/2026/01/23/7 Mailing ListThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2025-27821), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.