CVE-2025-12970

Local code execution via unchecked container-name copy

Published Nov 24, 2025 · Updated Jan 7, 2026

Stack-based buffer overflow in Fluent Bit before 4.0.12 allows local users to crash the agent or execute code via a long container name. The in_docker plugin's extract_name function copies the Docker API name into a fixed-size stack buffer without first validating its length. Exploitation requires control of container names and use of the Docker input; successful code execution compromises the host-side Fluent Bit process.

CVSS severity8.8
High
EPSS probability1.03%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stack-based buffer overflow in Fluent Bit before 4.0.12 allows local users to crash the agent or execute code via a long container name. The in_docker plugin's extract_name function copies the Docker API name into a fixed-size stack buffer without first validating its length. Exploitation requires control of container names and use of the Docker input; successful code execution compromises the host-side Fluent Bit process.

The record

CVE
CVE-2025-12970
Published
Nov 24, 2025
Updated
Jan 7, 2026
Vendor
Fluent Bit
Product
Fluent Bit
Classifications
CWE-121, CWE-120, T1499, T1068
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Nov 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Jan 7, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <4.0.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Fluent Bit · Fluent Bitversion=0 <4.0.12

Published CVSS scores

8.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499Endpoint Denial of Service
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo