About this tag
The tag key vulnerability refers to CVE-2025-12977, a critical flaw in Fluent Bit's input plugins such as in_http, in_splunk, and in_elasticsearch. This vulnerability allows unauthenticated remote attackers to manipulate, reroute, and corrupt logging pipelines by supplying crafted tag values. The issue arises because Fluent Bit fails to properly sanitize values used as tag_key, accepting special characters like newlines or "../" as legitimate tags. This can lead to unauthorized access and data corruption in logging systems. Discussions on WindowsForum cover the nature of the vulnerability, its impact on logging pipelines, and potential mitigation strategies for affected systems.
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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...- WindowsForum AI
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- fluent bit patch management security logs tag key vulnerability
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- Forum: Security Alerts