CVE-2026-44025: Fluent Fluentd information disclosure in Monitor Agent plugin

CVE-2026-44025 · Severity: high · CVSS 7.5 · Published 2026-07-08

Fluentd is a popular data collection tool used to gather logs and events from various sources. A security flaw in its monitoring component allows sensitive information, such as database passwords, API keys, and cloud credentials, to be exposed through a public web interface. If an attacker can access this interface, they could steal these credentials to gain unauthorized access to other corporate systems and data.

Technologies: fluentd (RubyGems). Vendors: RubyGems.

Quick answers

Is CVE-2026-44025 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-44025 being exploited in the wild.
How severe is CVE-2026-44025?
High severity, with a CVSS score of 7.5, published 8 July 2026.
Which products and versions are affected?
fluentd (RubyGems) <= 1.19.2, ECOSYSTEM:introduced=0,fixed=1.19.3.
Is there a fix for CVE-2026-44025?
Yes. fluentd (RubyGems): upgrade to 1.19.3 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-44025 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-44025?
Check whether you run fluentd (RubyGems) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • fluentd (RubyGems): upgrade to 1.19.3 or later
    bundle update fluentd

Technical details

The Fluentd Monitor Agent plugin (in_monitor_agent) contains an information disclosure vulnerability due to missing authentication and overly verbose default configurations. The REST API endpoints, specifically /api/plugins.json, include internal instance variables of loaded plugins in their responses. If plugins store sensitive data like passwords or cloud tokens in these variables, they are transmitted in plain text. An unauthenticated attacker with network access to the Monitor Agent port (default 24220) can extract these credentials. The issue is addressed in version 1.19.3 by changing the default visibility of configuration, retry, and debug information to 'false' and restricting query parameter overrides.

Affected products

  • Fluent Fluentd < 1.19.3

Identifiers

  • CVE-2026-44025
  • GHSA-pr7j-96cj-549h

Timeline

  • 2026-06-25: patched: Fix committed and version 1.19.3 released.
  • 2026-06-26: advisory: GitHub Security Advisory GHSA-pr7j-96cj-549h published.
  • 2026-07-08: disclosed: CVE-2026-44025 published to NVD.

References

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