Improper handling of highly compressed data in Fluentd - CVE-2026-44160
Published: June 29, 2026
Vulnerability identifier: #VU135829
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-44160
CWE-ID: CWE-409
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 cause a denial of service.
The vulnerability exists due to improper handling of highly compressed data in the `in_http` and `in_forward` plugins when processing gzip-compressed input. A remote attacker can send a maliciously crafted, highly compressed payload to cause a denial of service.
The issue can lead to memory exhaustion and an out-of-memory kill of the Fluentd process.
How to mitigate CVE-2026-44160
Install security update from vendor's website.