Vulnerability Report

CVE-2026-44024

RCE

Title: Path Traversal leading to RCE in Fluentd

Arbitrary File Access

Proof Of Concept

PoC Available for CVE-2026-44024

CWE Category CWE-22

Published Date Jul 08, 2026

Modified Date Jul 13, 2026

Exploit Status Available

Score 9.8 CVSS v3.1

Exploit Probability (EPSS)

1.09%

Vulnerability Summary

CVE-2026-44024: 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 allows dynamically constructing file paths using the ${tag} placeholder, and insufficient validation of ${tag} in file configurations such as the path parameter of the out_file plugin allows attackers sending untrusted tags containing path traversal characters to write or overwrite arbitrary files and potentially achieve remote code execution. This issue is fixed in version 1.19.3.

Impacted Vendors

fluentd 1

Reference Links

https://github.com/fluent/fluentd/commit/45c87a81f3ac0b72b3f9dcfe8cfb5f9038f81437 https://github.com/fluent/fluentd/pull/5391 https://github.com/fluent/fluentd/releases/tag/v1.19.3 https://github.com/fluent/fluentd/security/advisories/GHSA-44hj-4m45-frj3

CVSS v3.1

Source Entity [email protected]

Severity CRITICAL

9.8

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Associated Attack Patterns (CAPEC)

Total: Patterns