CVE-2026-44024
Fluentd: Remote Code Execution (RCE) via Arbitrary File Write in `${tag}` Placeholder
CRITICAL 9.8EPSS 1.1%
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.
- Affected
- fluent · fluentd
- CVSS v3.1 GITHUB
- 9.8 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS
- 1.08% chance of exploitation in the next 30 days, 65th percentile
- Published
- 2026-07-08
- Updated
- 2026-07-10
Proof-of-concept exploits (1)
- 0xdak/CVE-2026-44024_exploit0★ · 2026-08-05
Security advisories
- fluent/fluentd/security/advisories/GHSA-44hj-4m45-frj3
- advisories/GHSA-44hj-4m45-frj3
- fluent/fluentd/pull/5391