fluent Fluentd up to 1.19.2 out_file path path traversal

Summaryinfo

A vulnerability has been found in fluent Fluentd up to 1.19.2 and classified as very critical. Affected by this issue is some unknown functionality of the component out_file. Performing a manipulation of the argument path results in path traversal. This vulnerability is reported as CVE-2026-44024. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability classified as very critical has been found in fluent Fluentd up to 1.19.2. This affects an unknown part of the component out_file. The manipulation of the argument path with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-44024 since 05/04/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Additional levels of successful authentication are required for exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/09/2026). MITRE ATT&CK project uses the attack technique T1006 for this issue.

Upgrading to version 1.19.3 eliminates this vulnerability.

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Productinfo

Vendor

• fluent

Name

• Fluentd

Version

• 1.19.0
• 1.19.1
• 1.19.2

Website

• Product: https://github.com/fluent/fluentd/

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