CVE-2025-12972
Medium · 5.3CVSS
5.3
EPSS
0.9%
Published
Nov 24, 2025
CISA due date
—
The record
Fluent Bit out_file plugin does not properly sanitize tag values when deriving output file names. When the File option is omitted, the plugin uses untrusted tag input to construct file paths. This allows attackers with network access to craft tags containing path traversal sequences that cause Fluent Bit to write files outside the intended output directory.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| Bitnami | fluent-bit | 4.1.0 | 4.1.1 |
Related vulnerabilities
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- CVE-2025-12969 Fluent Bit in_forward input plugin does not properly enforce the security.users… Also affects fluent-bit
- CVE-2025-12978 Fluent Bit in_http, in_splunk, and in_elasticsearch input plugins contain a flaw in the… Also affects fluent-bit
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