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.
Metrics
Affected Vendors & Products
References
| Link | Providers |
|---|---|
| https://fluentbit.io/announcements/v4.1.0/ |
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History
Fri, 28 Nov 2025 15:30:00 +0000
| Type | Values Removed | Values Added |
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| First Time appeared |
Treasuredata
Treasuredata fluent Bit |
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| Weaknesses | NVD-CWE-noinfo | |
| CPEs | cpe:2.3:a:treasuredata:fluent_bit:4.1.0:*:*:*:*:*:*:* | |
| Vendors & Products |
Treasuredata
Treasuredata fluent Bit |
Wed, 26 Nov 2025 11:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Fluentbit
Fluentbit fluent Bit |
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| Vendors & Products |
Fluentbit
Fluentbit fluent Bit |
Mon, 24 Nov 2025 16:15:00 +0000
| Type | Values Removed | Values Added |
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| Metrics |
cvssV3_1
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Mon, 24 Nov 2025 14:45:00 +0000
| Type | Values Removed | Values Added |
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| 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. | |
| Title | CVE-2025-12978 | |
| References |
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Status: PUBLISHED
Assigner: certcc
Published: 2025-11-24T14:42:06.305Z
Updated: 2025-11-28T17:46:39.028Z
Reserved: 2025-11-10T18:57:32.141Z
Link: CVE-2025-12978
Updated: 2025-11-24T15:10:53.870Z
Status : Analyzed
Published: 2025-11-24T15:15:46.873
Modified: 2025-11-28T15:21:42.540
Link: CVE-2025-12978
No data.