CVE-2026-44161: fluentd before 1.19.3 (exclusive), < 1.19.3

CVE-2026-44161. CVSS 3.1 base score 7.2 (HIGH, Vendor/CNA). EPSS 0.00442 (percentile 0.374), scored 24-Oct-2026.

Affected technology

fluentd · before 1.19.3 (exclusive)
fluentd

fluentd · < 1.19.3
fluent

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 3.1): Network (remote) · No privileges required · No user interaction required

What an attacker can do

The source says prior to 1.19.3, the Fluentd out_http output plugin allows placeholders such as ${tag} in the endpoint configuration parameter, and if a placeholder value is derived from untrusted input an attacker can control the destination hostname of outbound HTTP requests and force requests to arbitrary internal services. Vendor/CNA’s CVSS 3.1 assessment (base score 7.2/10) rates confidentiality and availability impact as low; integrity impact as none.

Published 25-Oct-2026 19:52 UTC

CWE: CWE-918
CCR priority: 28.9 /100 (P4)
CVSS 3.1: 7.2 /10 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:L · Vendor/CNA
EPSS: 0.00442 · percentile 0.38111 · 2026-10-25
KEV: no

Provenance

FIRST EPSS daily exploit-probability · Source record · observed 2026-10-25 19:52:47.952465+00:00 UTC
NVD CVE API 2.0 · Source record · observed 2026-10-25 19:51:06.643138+00:00 UTC

Stable permalink: https://cybercodered.org/item/cve-cve-2026-44161.html