CVE-2025-12978
Quick assessment
Affected
FluentBit Fluent Bit
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Fluent Bit是Fluent开源的一款使用C语言编写的开源日志处理和分析系统。 Fluent Bit存在安全漏洞，该漏洞源于tag_key验证逻辑缺陷，可能导致记录重定向到非预期目标。
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I. Basic Information for CVE-2025-12978
Vulnerability Information
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Vulnerability Title
CVE-2025-12978
Source: CVE Program / CVE List V5
Vulnerability Description
Fluent Bit in_http, in_splunk, and in_elasticsearch input plugins contain a flaw in the tag_key validation logic that fails to enforce exact key-length matching. This allows crafted inputs where a tag prefix is incorrectly treated as a full match. A remote attacker with authenticated or exposed access to these input endpoints can exploit this behavior to manipulate tags and redirect records to unintended destinations. This compromises the authenticity of ingested logs and can allow injection of forged data, alert flooding and routing manipulation.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Fluent Bit 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Fluent Bit是Fluent开源的一款使用C语言编写的开源日志处理和分析系统。 Fluent Bit存在安全漏洞，该漏洞源于tag_key验证逻辑缺陷，可能导致记录重定向到非预期目标。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| FluentBit | Fluent Bit | 0 ~ 4.0.12 | - |
|
II. Public POCs for CVE-2025-12978
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · FluentBit · 2025-11-24 · 5 CVEs total
| CVE-2025-12972 | CVE-2025-12972 | |
| CVE-2025-12969 | CVE-2025-12969 | |
| CVE-2025-12977 | CVE-2025-12977 | |
| CVE-2025-12970 | CVE-2025-12970 |
IV. Related Vulnerabilities
V. Comments for CVE-2025-12978
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