What is CVE-2026-44025?

CVE-2026-44025 is a high-severity vulnerability in Fluent Fluentd, classified under Missing Authentication for Critical Function. CVSS score: 7.5/10. Published 2026-07-08.

How severe is CVE-2026-44025?

High severity. CVSS v3 base score is 7.5 out of 10.

Auth bypass in Fluent Fluentd

CVE-2026-44025

Fluentd collects events from various data sources and writes them to files, RDBMS, NoSQL, IaaS, SaaS, Hadoop and so on. Prior to 1.19.3, Fluentd's Monitor Agent plugin in_monitor_agent exposes internal metrics and plugin information via a REST API, and responses from /api/plugins.json and related endpoints unintentionally include internal instance variables that may contain database passwords, API keys, or cloud credentials. This issue is fixed in version 1.19.3.

Vulnerability class: Broken Authentication

EPSS: 0.004 (34.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Fluent Fluentd — versions < 1.19.3
Fluentd

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

security-advisories@github.com (x_refsource_CONFIRM, Patch, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC, Issue Tracking)
security-advisories@github.com (Patch, x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC, Release Notes)

Frequently asked questions

What is CVE-2026-44025?: CVE-2026-44025 is a high-severity vulnerability in Fluent Fluentd, classified under Missing Authentication for Critical Function. CVSS score: 7.5/10. Published 2026-07-08.
How severe is CVE-2026-44025?: High severity. CVSS v3 base score is 7.5 out of 10.