Deserialization of Untrusted Data in Fluentd - CVE-2022-39379
Published: September 22, 2025
Vulnerability identifier: #VU116003
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2022-39379
CWE-ID: CWE-502
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 user to execute arbitrary code on the target system.
The vulnerability exists due to insecure input validation when processing serialized data if the environment variable "FLUENT_OJ_OPTION_MODE" is explicitly set to "object". A remote user can pass specially crafted data to the application and execute arbitrary code on the target system.
How to mitigate CVE-2022-39379
Install updates from vendor's website.