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CVE-2025-12978

5.4 medium SSVC exploitation: none Analyzed
NVD · CVE.org

Fluent Bit in_http, in_splunk, and in_elasticsearch input plugins contain a flaw in the tag_key validation logic that fails to enforce exact key-length matching. This allows crafted inputs where a tag prefix is incorrectly treated as a full match. A remote attacker with authenticated or exposed access to these input endpoints can exploit this behavior to manipulate tags and redirect records to unintended destinations. This compromises the authenticity of ingested logs and can allow injection of forged data, alert flooding and routing manipulation.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 1

  1. First seenCVSS 5.4 · treasuredataNVD modified 2026-10-08 10:10

Affected (CPE criteria) 1

  • cpe:2.3:a:treasuredata:fluent_bit:4.1.0:*:*:*:*:*:*:*

References 1