CVE-2026-44024CWE-22

Fluentd: Remote Code Execution (RCE) via Arbitrary File Write in `${tag}` Placeholder

Critical · published July 8, 2026

CVSS v3.1
9.8
EPSS
1%
Percentile
65.0
In the wild
Unconfirmed
What it 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 record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.01085 · 65.0th percentile
Weakness
CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Published
2026-07-08T21:20Z
EPSS history
Timeline
  • 08 JUL 21:20Z
    Fluentd: Remote Code Execution (RCE) via Arbitrary File Write in `${tag}` Placeholder
    cvelistv5