CVE-2025-12970: fluentbit fluent bit Classic Buffer Overflow

Vulnerability summary

CVE-2025-12970 is a high (CVSS 8.8) Classic Buffer Overflow vulnerability in fluentbit fluent bit. EPSS estimates a 1.03% chance of exploitation in the next 30 days, higher than 63.5% of scored vulnerabilities.

Timeline

1. 24-11-2025
   PublishedVulnerability first disclosed.
2. 07-01-2026
   Last modifiedVulnerability information updated.

Description

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 overflows the buffer, leading to process crash or arbitrary code execution.

• CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.