Vulnerability Details CVE-2025-12977
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 18.9%
CVSS Severity
CVSS v3 Score 9.1
References
Products affected by CVE-2025-12977
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cpe:2.3:a:treasuredata:fluent_bit:4.1.0