VULNERABILITY INTELLIGENCE
CVE-2025-12977
CVSS score9.1 CRITICAL
EPSS probability0.76%
CISA KEVNot currently listed
Published2025-11-24
Last modified2026-10-18
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
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.
Weakness classification
- 134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-1287