CVE-2026-44161 Fluentd: Server-Side Request Forgery (SSRF) via Placeholder Expansion in `out_http`

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 outhttp output plugin allows placeholders such as $tag in the endpoint configuration parameter, and if a placeholder value is derived from untrusted...

CVE-2026-44161

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 outhttp output plugin allows placeholders such as $tag in the endpoint configuration parameter, and if a placeholder value is derived from untrusted...

CVE-2026-44161

Fluentd’s out_http plugin (pre-1.19.3) allows placeholders such as ${tag} in the endpoint configuration. If a placeholder comes from untrusted input, an attacker can control the destination hostname of outbound HTTP requests and force requests to arbitrary internal services (SSRF). Affected versi...