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No exploitation reportedFix available

CVE-2025-12972

No exploitation reported by the sources we read.

  • Published2025-11-24
  • WeaknessCWE-22

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2025-11-2415:15CVE publishedNVD

Versions per branch

NVD · OSV
Treasuredata fluent bit
BranchAffectedFixed in
4.1= 4.1.0no fix published
fluent-bit
BranchAffectedFixed in
4.1≥ 4.1.0, < 4.1.14.1.1

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As certcc, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • FluentBit Fluent Bit
    Affected
    • < 4.0.12fixed in 4.0.12custom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-01-07

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Published
2025-11-24
Last Modified
2026-10-08
NVD status
Modified
GitHub Advisory
GHSA-mjmc-4hm9-g39m

Frequently asked questions

What is CVE-2025-12972?

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.

Is CVE-2025-12972 actively exploited?

Active exploitation of CVE-2025-12972 has not been confirmed. Its EPSS score was 0.9% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2025-12972?

CVE-2025-12972 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

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