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.
References
History

Wed, 26 Nov 2025 11:15:00 +0000

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

Mon, 24 Nov 2025 20:15:00 +0000

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 14:45:00 +0000

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

cve-icon MITRE

Status: PUBLISHED

Assigner: certcc

Published: 2025-11-24T14:40:12.642Z

Updated: 2025-11-24T19:14:10.912Z

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 : Awaiting Analysis

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

Modified: 2025-11-25T22:16:16.690

Link: CVE-2025-12977

cve-icon Redhat

No data.