CVE-2026-44024
Fluentd: Remote Code Execution (RCE) via Arbitrary File Write in ${tag} Placeholder
- Published
- Jul 8, 2026
- Updated
- Jul 10, 2026
- Assigning CNA
- GitHub_M
- Evidence observed
- Aug 5, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HLow · next 30 days
- Percentile
- 63.3%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
1- CVE-2026-44024_exploitExploit
Proof-of-concept exploit for CVE-2026-44024, using a crafted in_forward tag to write arbitrary files through Fluentd's out_file path traversal and trigger command execution.
Responsible use
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