CVE-2025-12972
Medium
Description
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.
SeverityMedium
CVSS5.3
Exploit probability—
ProductTreasuredata Fluent Bit
PublishedNov 24, 2025
First seenNov 24, 2025
Weakness typeCWE-35CWE-35
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| treasuredata fluent_bit | 4.1.0 | — |
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