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CVE-2025-12977

9.1 critical SSVC exploitation: none Modified
NVD · CVE.org

Fluent Bit in_http, in_splunk, and in_elasticsearch input plugins fail to sanitize tag_key inputs. An attacker with network access or the ability to write records into Splunk or Elasticsearch can supply tag_key values containing special characters such as newlines or ../ that are treated as valid tags. Because tags influence routing and some outputs derive filenames or contents from tags, this can allow newline injection, path traversal, forged record injection, or log misrouting, impacting data integrity and log routing.

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 9.1 · treasuredataNVD modified 2026-10-18 20:10

Affected (CPE criteria) 1

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

References 2