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7 vulnerabilities by FluentBit
CVE-2025-12978 (GCVE-0-2025-12978)
Vulnerability from cvelistv5 – Published: 2025-11-24 14:42 – Updated: 2026-01-07 15:36
VLAI
Title
CVE-2025-12978
Summary
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.
Severity
5.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-187 - Partial String Comparison
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| FluentBit | Fluent Bit |
Affected:
0 , < 4.0.12
(custom)
|
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CVE-2025-12969 (GCVE-0-2025-12969)
Vulnerability from cvelistv5 – Published: 2025-11-24 14:41 – Updated: 2026-01-07 15:36
VLAI
Title
CVE-2025-12969
Summary
Fluent Bit in_forward input plugin does not properly enforce the security.users authentication mechanism under certain configuration conditions. This allows remote attackers with network access to the Fluent Bit instance exposing the forward input to send unauthenticated data. By bypassing authentication controls, attackers can inject forged log records, flood alerting systems, or manipulate routing decisions, compromising the authenticity and integrity of ingested logs.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-306 - Missing Authentication for Critical Function
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| FluentBit | Fluent Bit |
Affected:
0 , < 4.0.13
(custom)
|
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CVE-2025-12972 (GCVE-0-2025-12972)
Vulnerability from cvelistv5 – Published: 2025-11-24 14:40 – Updated: 2026-01-07 15:36
VLAI
Title
CVE-2025-12972
Summary
Fluent Bit out_file plugin does not properly sanitize tag values when deriving output file names. When the File option is omitted, the plugin uses untrusted tag input to construct file paths. This allows attackers with network access to craft tags containing path traversal sequences that cause Fluent Bit to write files outside the intended output directory.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-35 - Path Traversal
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| FluentBit | Fluent Bit |
Affected:
0 , < 4.0.12
(custom)
|
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CVE-2025-12977 (GCVE-0-2025-12977)
Vulnerability from cvelistv5 – Published: 2025-11-24 14:40 – Updated: 2026-01-07 15:36
VLAI
Title
CVE-2025-12977
Summary
Fluent Bit in_http, in_splunk, and in_elasticsearch input plugins fail to sanitize tag_key inputs. An attacker with network access or the ability to write records into Splunk or Elasticsearch can supply tag_key values containing special characters such as newlines or ../ that are treated as valid tags. Because tags influence routing and some outputs derive filenames or contents from tags, this can allow newline injection, path traversal, forged record injection, or log misrouting, impacting data integrity and log routing.
Severity
9.1 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| FluentBit | Fluent Bit |
Affected:
0 , < 4.0.12
(custom)
|
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CVE-2025-12970 (GCVE-0-2025-12970)
Vulnerability from cvelistv5 – Published: 2025-11-24 14:39 – Updated: 2026-01-07 15:36
VLAI
Title
CVE-2025-12970
Summary
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.
Severity
8.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-121 - Stack-based Buffer Overflow
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| FluentBit | Fluent Bit |
Affected:
0 , < 4.0.12
(custom)
|
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CVE-2025-29478 (GCVE-0-2025-29478)
Vulnerability from cvelistv5 – Published: 2025-04-07 00:00 – Updated: 2025-04-08 13:31
VLAI
Summary
An issue in fluent-bit v.3.7.2 allows a local attacker to cause a denial of service via the cfl_list_size in cfl_list.h:165.
Severity
5.5 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
1 reference
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CVE-2025-29477 (GCVE-0-2025-29477)
Vulnerability from cvelistv5 – Published: 2025-04-04 00:00 – Updated: 2025-04-07 18:31
VLAI
Summary
An issue in fluent-bit v.3.7.2 allows a local attacker to cause a denial of service via the function consume_event.
Severity
5.5 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
1 reference
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"baseScore": 5.5,
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"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:H",
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