Fluent Bit 4.1 · Version Status
Fluent Bit 4.1 End of Life Date
Fluent Bit 4.1 end-of-life date, support status, and CVE risk. Data from endoflife.date and official vendor documentation.
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Fluent Bit 4.1 is past end of life. This version no longer receives security patches. 87 days past EOL — migrate to a supported version immediately.
EOL Date
Feb 11, 2026
87 days past EOL
Latest Release
4.1.2
Standard release
Release Date
Sep 24, 2025
Fluent Bit 4.1 series
| Version | Latest | EOL Date | Status |
|---|
| 0.10 |
0.10.1 |
Supported |
Active |
| 0.11 |
0.11.17 |
Supported |
Active |
| 0.12 |
0.12.19 |
Supported |
Active |
| 0.13 |
0.13.8 |
Supported |
Active |
| 0.14 |
0.14.9 |
Supported |
Active |
| 1.0 |
1.0.6 |
Supported |
Active |
| 1.1 |
1.1.3 |
Supported |
Active |
| 1.2 |
1.2.2 |
Supported |
Active |
What does Fluent Bit 4.1 end of life mean?
When Fluent Bit 4.1 reaches end of life, the maintainers stop issuing security patches for this version. CVEs discovered after the EOL date are publicly disclosed on the National Vulnerability Database with no patch available. Exploit code frequently appears on GitHub within days of disclosure.
The CVE blind spot: Most vulnerability scanners check for known CVEs but do not flag the ongoing accumulation of unpatched vulnerabilities in EOL software versions. Running Fluent Bit 4.1 past its EOL date creates a permanently growing attack surface that standard security tooling will not surface.
Migrate to Fluent Bit 5.0 or implement compensating controls — network segmentation, enhanced monitoring, restricted access — while migration is underway.
Frequently Asked Questions
When does Fluent Bit 4.1 reach end of life?
Fluent Bit 4.1 reached end of life on February 11, 2026. This version is no longer receiving security patches.
Is Fluent Bit 4.1 still supported?
No. Fluent Bit 4.1 reached end of life on February 11, 2026 and is no longer receiving security patches.
What should I upgrade to from Fluent Bit 4.1?
The recommended upgrade from Fluent Bit 4.1 is
Fluent Bit 5.0 — the latest actively supported version. Check the
Fluent Bit full timeline for all supported versions.
What are the security risks of running Fluent Bit 4.1 past EOL?
When Fluent Bit 4.1 reaches end of life, the maintainers stop issuing security patches. Any CVEs disclosed after the EOL date accumulate with no remediation path. Most vulnerability scanners do not flag this — it is the CVE blind spot. Organizations running EOL Fluent Bit should migrate immediately or implement compensating controls.