fluent bit

About this tag
Fluent Bit is a lightweight, high-performance telemetry agent widely used as a log forwarder and data pipeline component in observability stacks. Discussions on WindowsForum.com focus on security vulnerabilities affecting Fluent Bit, including CVEs that cause denial of service via HTTP input parsing, memory corruption in the HTTP server, stack overflows in the Docker plugin, tag key injection, and authentication bypass in the forward plugin. These threads cover patching strategies, mitigation steps, and the impact on log collection and monitoring pipelines. The tag is relevant for IT professionals managing Fluent Bit deployments who need to stay informed about critical security updates and best practices for securing telemetry infrastructure.

  1. Fluent Bit CVE-2024-23722 DoS via HTTP Input Payload Parsing – Fix in v2.2.2

    A low-level parsing bug in Fluent Bit’s HTTP input has been cataloged as CVE‑2024‑23722 and quietly but decisively demonstrates how a small string-validation lapse can turn a ubiquitous telemetry agent into a reliable denial‑of‑service trigger for observability pipelines. The vulnerability...
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    • cybersecurity fluent bit observability vulnerability management
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    • Forum: Security Alerts

  2. Fluent Bit CVE-2024-4323: Patch Memory Corruption in HTTP Server Now

    A critical heap-based memory corruption bug in Fluent Bit’s built-in HTTP server — tracked as CVE-2024-4323 — lets unauthenticated network actors trigger crashes, leak internal data, and, in specific environments, potentially execute code. Fluent Bit maintainers published a patch in Fluent Bit...
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    • cve 2024 4323 fluent bit http server patch memory corruption
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    • Forum: Security Alerts

  3. CVE-2025-29478: Fluent Bit DoS via cfl_list_size size_t conversion in v3.7.2

    A newly cataloged vulnerability, CVE-2025-29478, in Fluent Bit v3.7.2 exposes a local denial-of-service (DoS) condition in the library's linked-list helper, specifically the cfl_list_size function in cfl_list.h at line 165, enabling a low-privileged local actor to crash or hang Fluent Bit and...
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    • cve 2025 29478 denial of service fluent bit observability
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    • Forum: Security Alerts

  4. CVE-2025-12970 Fluent Bit Docker Plugin Stack Overflow Patch Now

    A stack-buffer overflow in Fluent Bit’s Docker input plugin has been cataloged as CVE-2025-12970, and it’s the kind of flaw that turns a seemingly innocuous container name into a potential foothold for attackers. The vulnerability stems from the in_docker plugin’s extract_name routine copying...
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    • docker plugin fluent bit kubernetes security vulnerability
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    • Forum: Security Alerts

  5. CVE-2025-12977: Critical Fluent Bit Tag Key Vulnerability and Mitigations

    CVE-2025-12977 exposes a critical tag‑handling vulnerability in Fluent Bit that can let unauthenticated remote actors manipulate, reroute, and corrupt logging pipelines by supplying crafted tag values. Overview — the short story What it is: a flaw in Fluent Bit’s input plugins (notably in_http...
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    • fluent bit patch management security logs tag key vulnerability
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    • Forum: Security Alerts

  6. CVE-2025-12969: Fluent Bit Forward Plugin Auth Bypass and Log Poisoning Risk

    A critical unauthenticated data-injection flaw in Fluent Bit’s forward input plugin has been publicly cataloged as CVE-2025-12969; the bug lets an attacker who can reach a Fluent Bit forward listener send unauthenticated records by bypassing the configured security.users control, enabling forged...
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    • cve 2025 12969 fluent bit log integrity security patch
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    • Forum: Security Alerts