Path traversal in Fluentd - CVE-2026-44024
Published: June 29, 2026
Vulnerability identifier: #VU135827
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-44024
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Fluentd Project
Affected software:
Fluentd
Fluentd
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to path traversal in the `${tag}` placeholder handling in file path configuration when processing log tags from untrusted sources. A remote attacker can inject path traversal sequences into a crafted tag to execute arbitrary code.
Exploitation requires the `${tag}` placeholder to be used in file-related configuration such as the `path` parameter, and certain formatting options can enable arbitrary file write or overwrite of existing files.
How to mitigate CVE-2026-44024
Install security update from vendor's website.