Flaws Expose Risks in Fluent Bit Logging Agent

Cybersecurity researchers disclosed multiple critical vulnerabilities in Fluent Bit—affecting inputs, tag processing and output handling—that can enable tag spoofing, malicious record injection, path traversal (allowing file overwrite), a Docker metrics stack buffer overflow, and an authentication bypass in the forward input plugin. Patches (Fluent Bit v4.1.1 and v4.0.12) were released; operators are urged to update, avoid dynamic tags, lock down outputs, run least-privilege, and mount configs read-only to protect observability pipelines across cloud, Kubernetes, and SaaS environments.