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.
Fix
Patch, vendor advisory and mitigation references on NVD 3
- https://github.com/fluent/fluentd/commit/c6a01ea2e0ea01977f8d615f7c6dbfae4cba88c9 Patch
- https://github.com/fluent/fluentd/pull/5394 Issue Tracking, Patch
- https://github.com/fluent/fluentd/security/advisories/GHSA-72f5-rr8c-r6gr Mitigation, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 7.2 · fluentdNVD modified 2026-10-25 17:10
Affected (CPE criteria) 1
cpe:2.3:a:fluentd:fluentd:*:*:*:*:*:*:*:*
References 4
- https://github.com/fluent/fluentd/commit/c6a01ea2e0ea01977f8d615f7c6dbfae4cba88c9 Patch
- https://github.com/fluent/fluentd/pull/5394 Issue Tracking, Patch
- https://github.com/fluent/fluentd/releases/tag/v1.19.3 Product, Release Notes
- https://github.com/fluent/fluentd/security/advisories/GHSA-72f5-rr8c-r6gr Mitigation, Vendor Advisory