CVE-2026-44161 | Fluentd collects events from various data sources and writes… | CVSS 7.2 HIGH

Description

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, 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. This issue is fixed in version 1.19.3.

Metadata

CVE ID: CVE-2026-44161
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-05-05 14:39 UTC
Published: 2026-07-08 21:25 UTC
Last updated: 2026-07-08 21:25 UTC
Primary CWE: CWE-918
CWE-918: Server-Side Request Forgery (SSRF)
Vendor / Product: fluent / fluentd
Sources: cve.org · NVD

Severity & Metrics

7.2 HIGH CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:L

Affected products (1)

Vendor	Product	Platform	Versions
fluent	fluentd	—	< 1.19.3

Weakness (CWE)

CWE	Source	Description
CWE-918	cna	CWE-918: Server-Side Request Forgery (SSRF)

CVSS scores (1)

Score	Severity	Version	Source	Vector
7.2	HIGH	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:L

References (4)

https://github.com/fluent/fluentd/security/advisories/GHSA-72f5-rr8c-r6gr https://github.com/fluent/fluentd/security/advisories/GHSA-72f5-rr8c-r6gr
https://github.com/fluent/fluentd/pull/5394 https://github.com/fluent/fluentd/pull/5394
https://github.com/fluent/fluentd/commit/c6a01ea2e0ea01977f8d615f7c6dbfae4cba88c9 https://github.com/fluent/fluentd/commit/c6a01ea2e0ea01977f8d615f7c6dbfae4cba88c9
https://github.com/fluent/fluentd/releases/tag/v1.19.3 https://github.com/fluent/fluentd/releases/tag/v1.19.3