What is CVE-2025-12970?

CVE-2025-12970 is a high-severity vulnerability in Fluentbit Fluent Bit, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.8/10. Published 2025-11-24.

How severe is CVE-2025-12970?

High severity. CVSS v3 base score is 8.8 out of 10.

Buffer overflow in Fluentbit Fluent Bit

CVE-2025-12970

The extract_name function in Fluent Bit in_docker input plugin copies container names into a fixed size stack buffer without validating length. An attacker who can create containers or control container names, can supply a long name that o…

Vulnerability class: Buffer Overflow

EPSS: 0.008 (51.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Fluentbit Fluent Bit — versions 0
Treasuredata Fluent_bit — versions 4.1.0

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

Frequently asked questions

What is CVE-2025-12970?: CVE-2025-12970 is a high-severity vulnerability in Fluentbit Fluent Bit, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.8/10. Published 2025-11-24.
How severe is CVE-2025-12970?: High severity. CVSS v3 base score is 8.8 out of 10.