CVE-2026-44161
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.
SeverityHigh
CVSS7.2
Exploit probability—
ProductFluentd
PublishedJul 8, 2026
First seenJul 8, 2026
Weakness typeCWE-918Server-side request forgery (SSRF)
How to fix
Update
- fluentd fluentd1.19.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| fluentd fluentd | v < 1.19.3 | 1.19.3 |
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