Fluent Bit security fixes in v4.1.1 and v4.0.12
Security Patch Release
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Fluent Bit shipped v4.1.1 and v4.0.12 in early October 2025 to fix critical vulnerabilities in a telemetry agent used across cloud logging pipelines. The release matters because unpatched deployments could let network-accessible attackers spoof tags, inject malicious records, or manipulate file paths. Operators were urged to update quickly to reduce risk to observability and downstream security tooling.
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24.11.2025 17:00 2 articles · 6mo ago
Oligo Security discloses critical Fluent Bit vulnerabilities
Technical Analysis UpdateOligo Security disclosed critical vulnerabilities in Fluent Bit, a telemetry/logging agent deployed more than 15 billion times, and said the flaws affect input validation, tag processing, output handling, Docker metrics parsing, and the forward input plugin. The advisory says the issues were addressed in Fluent Bit v4.1.1 and v4.0.12 in early October 2025, and operators should update quickly because network-accessible attackers could spoof tags, inject malicious records, manipulate file paths, trigger a stack buffer overflow, or bypass authentication in the forward input plugin.
Show sources
- Flaws Expose Risks in Fluent Bit Logging Agent — www.infosecurity-magazine.com — 24.11.2025 17:00
- Flaws Expose Risks in Fluent Bit Logging Agent — www.infosecurity-magazine.com — 24.11.2025 17:00