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.
Advisories

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Fixes

Solution

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Workaround

No workaround given by the vendor.

History

Sat, 29 Nov 2025 03:30:00 +0900

Type Values Removed Values Added
References

Sat, 29 Nov 2025 03:00:00 +0900


Sat, 29 Nov 2025 00:30:00 +0900

Type Values Removed Values Added
First Time appeared Treasuredata
Treasuredata fluent Bit
CPEs cpe:2.3:a:treasuredata:fluent_bit:4.1.0:*:*:*:*:*:*:*
Vendors & Products Treasuredata
Treasuredata fluent Bit

Wed, 26 Nov 2025 20:15:00 +0900

Type Values Removed Values Added
First Time appeared Fluentbit
Fluentbit fluent Bit
Vendors & Products Fluentbit
Fluentbit fluent Bit

Tue, 25 Nov 2025 05:15:00 +0900

Type Values Removed Values Added
Weaknesses CWE-1287
Metrics cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 24 Nov 2025 23:45:00 +0900

Type Values Removed Values Added
Description 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.
Title CVE-2025-12977
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: certcc

Published:

Updated: 2026-01-07T15:36:34.434Z

Reserved: 2025-11-10T18:57:07.686Z

Link: CVE-2025-12977

cve-icon Vulnrichment

Updated: 2025-11-24T19:13:05.578Z

cve-icon NVD

Status : Modified

Published: 2025-11-24T15:15:46.770

Modified: 2025-11-28T18:15:46.550

Link: CVE-2025-12977

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2025-11-26T20:11:15Z

Weaknesses