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fluent-bit: all versions and old releases

Fast and Lightweight Logs, Metrics and Traces processor

Chronosphere Inc. Firewall & privacy #22 Firewall & privacy

5 versions of fluent-bit are listed here, from June 6, 2026 to the current 5.1.5. Each one links to the publisher’s own installer files.

2026: 5 5 26
VersionDateSizeFiles
5.1.5Latest October 21, 2026 39.9 MB 64-bit EXE (NSIS) 22.9 MB64-bit ZIP 39.9 MBARM64 EXE (NSIS) 21.5 MBARM64 ZIP 38.9 MB32-bit ZIP 36.9 MB32-bit EXE (NSIS) 21.2 MB
Release notes
https://fluentbit.io/announcements/v5.1.5/
What's Changed
- api: v2: trace: plug leaks on trace requests with duplicated parameters by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12569
- workflows: bump ossf/scorecard-action from 2.4.4 to 2.5.0 by @dependabot[bot] in https://github.com/fluent/fluent-bit/pull/12578
- workflows: bump reviewdog/action-actionlint from 1.80.0 to 1.80.1 by @dependabot[bot] in https://github.com/fluent/fluent-bit/pull/12588
- release: update to 5.1.5 by @github-actions[bot] in https://github.com/fluent/fluent-bit/pull/12591
- tests: runtime: out_http: push JSON format records together by @edsiper in https://github.com/fluent/fluent-bit/pull/12600
- router: apply input routes with a single input and output by @edsiper in https://github.com/fluent/fluent-bit/pull/12596
- out_cloudwatch_logs: fix log stream leak when group allocation fails by @ParakhJaggi in https://github.com/fluent/fluent-bit/pull/12257
- in_nginx_exporter_metrics: mitigate nginx plus response type confusion by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12609
- lua: bound MessagePack reads when pushing values to Lua by @edsiper in https://github.com/fluent/fluent-bit/pull/12597
- in_forward: mitigate forward trace decoding bypasses by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12615
- http_server: address cumulative bytes on http2 headers by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12590
- opentelemetry: in_opentelemetry: log_event_encoder: mitigate otel attributes quadratic encoding expansion by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12603
- oauth2_jwt: mitigate leaks on duplicated JWT members by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12605
- out_chronicle: add support for the Chronicle API by @cozybear-dev in https://github.com/fluent/fluent-bit/pull/12548
- http_client: out_loki: Mitigate crlf injection on HTTP headers by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12613
- filter_kubernetes: mitigate SEGV occurrences on using Use_Kubelet by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12580
- out_http: add PATCH as an http method by @cestercian in https://github.com/fluent/fluent-bit/pull/12552
- out_stackdriver: out_bigquery: out_chronicle: conceal jwt token on debug logs by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12604
- in_collectd: mitigate collectd unaligned type read by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12606
- filter_parser: free the previous parse buffer when Key_Name repeats by @cestercian in https://github.com/fluent/fluent-bit/pull/12539
- out_stackdriver: fix cacheHit copied from cacheLookup in httpRequest by @riccardonar in https://github.com/fluent/fluent-bit/pull/12469
- snappy: decompression: mitigate checksum fault on snappy decompression by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12614
- in_tail: fix missed copytruncate after cached size refresh by @edsiper in https://github.com/fluent/fluent-bit/pull/12618
New Contributors
- @cozybear-dev made their first contribution in https://github.com/fluent/fluent-bit/pull/12548
- @cestercian made their first contribution in https://github.com/fluent/fluent-bit/pull/12552
- @riccardonar made their first contribution in https://github.com/fluent/fluent-bit/pull/12469
Full Changelog: https://github.com/fluent/fluent-bit/compare/v5.1.4...v5.1.5
5.1.3 October 1, 2026 39.8 MB 64-bit ZIP 39.8 MB64-bit EXE (NSIS) 22.9 MBARM64 ZIP 38.7 MBARM64 EXE (NSIS) 21.5 MB32-bit EXE (NSIS) 21.2 MB32-bit ZIP 36.7 MB
Release notes
https://fluentbit.io/announcements/v5.1.3/
What's Changed
- release: update to 5.1.3 by @github-actions[bot] in https://github.com/fluent/fluent-bit/pull/12379
- workflows: bump reviewdog/action-actionlint from 1.73.3 to 1.73.4 by @dependabot[bot] in https://github.com/fluent/fluent-bit/pull/12381
- github: workflows: Mitigate order dependent issue for uploading task for Windows by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12382
- dockerfile: upgrade base packages to remediate OS CVEs (#12284) by @sachinbh95 in https://github.com/fluent/fluent-bit/pull/12291
- workflows: bump github/codeql-action/upload-sarif from 4.37.9 to 4.38.0 by @dependabot[bot] in https://github.com/fluent/fluent-bit/pull/12404
- http: downstream: plug intermittent unfriendly logs by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12407
- out_syslog: support RFC6578 by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12405
- tests: runtime: Stabilize chronicle assertions with eliminating push races by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12389
- tests: runtime: Fix assertion failures on Ubuntu 26.04 by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12388
- in_opentelemetry: preserve signed 64-bit log body integers by @edsiper in https://github.com/fluent/fluent-bit/pull/12419
- workflows: bump reviewdog/action-hadolint from 1.53.0 to 1.54.0 by @dependabot[bot] in https://github.com/fluent/fluent-bit/pull/12422
- workflows: bump reviewdog/action-shellcheck from 1.32.1 to 1.33.0 by @dependabot[bot] in https://github.com/fluent/fluent-bit/pull/12423
- workflows: bump reviewdog/action-actionlint from 1.73.4 to 1.74.0 by @dependabot[bot] in https://github.com/fluent/fluent-bit/pull/12421
- out_arvancloud_cloudlogs: add new output plugin for ArvanCloud CloudLogs by @javadnasrolahi in https://github.com/fluent/fluent-bit/pull/11095
- in_kubernetes_events: add sqlite indexes by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12366
- bulk_search: es: opensearch: Acknowledge reasons of bulk failures by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12358
- emitter: ml: plug data losses during multiline processing on shutdown by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12352
- out_kafka: implement protobuf format of kafka schema registry support by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12411
- input_chunk: fix down chunk placement under storage backpressure by @edsiper in https://github.com/fluent/fluent-bit/pull/12403
- out_s3: mitigate SEGV/heap corruption by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12380
- packaging: distros: centos: Enable kafka input/output plugins for Stream 9/10 by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12414
- packaging: distros: almalinux: rockylinux: Install zlib-devel correctly by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12415
- tests: fix CloudWatch event size regression coverage by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12424
- tests: runtime_shell: Add timeouts for runtime shell testing by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12386
- out_gcs: fix networking and worker crashes, add total_file_size by @balys in https://github.com/fluent/fluent-bit/pull/12390
- out_opentelemetry: preserve failed log batch results by @grolegor in https://github.com/fluent/fluent-bit/pull/12385
- in_podman_metrics: do not abort startup when the initial scrape fails by @stondo in https://github.com/fluent/fluent-bit/pull/12391
- opentelemetry: fix OTLP JSON trace status code interoperability by @edsiper in https://github.com/fluent/fluent-bit/pull/12428
- out_stackdriver: fix races on shared credentials by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12433
- workflows: bump docker/setup-qemu-action from 4.3.0 to 4.4.0 by @dependabot[bot] in https://github.com/fluent/fluent-bit/pull/12439
- workflows: bump docker/build-push-action from 7.3.0 to 7.4.0 by @depend
5.1.1 August 16, 2026 39.1 MB 64-bit EXE (NSIS) 22.8 MB64-bit ZIP 39.1 MBARM64 ZIP 37.9 MBARM64 EXE (NSIS) 21.0 MB32-bit ZIP 36.5 MB32-bit EXE (NSIS) 21.0 MB
Release notes
https://fluentbit.io/announcements/v5.1.1/
What's Changed
- packaging: improve package index tree URLs for release listing by @lecaros in https://github.com/fluent/fluent-bit/pull/12236
- in_storage_backlog: Fix persistent chunks issues without matching routes on hot reloading by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12239
- workflows: bump ossf/scorecard-action from 2.4.3 to 2.4.4 by @dependabot[bot] in https://github.com/fluent/fluent-bit/pull/12182
- workflows: bump actions/stale from 10.4.0 to 11.0.0 by @dependabot[bot] in https://github.com/fluent/fluent-bit/pull/12183
- workflows: bump github/codeql-action/upload-sarif from 4.37.3 to 4.37.4 by @dependabot[bot] in https://github.com/fluent/fluent-bit/pull/12229
- workflows: bump actions/checkout from 7.0.0 to 7.0.1 by @dependabot[bot] in https://github.com/fluent/fluent-bit/pull/12230
- workflows: bump reviewdog/action-shellcheck from 1.32.0 to 1.32.1 by @dependabot[bot] in https://github.com/fluent/fluent-bit/pull/12250
- workflows: bump reviewdog/action-actionlint from 1.73.0 to 1.73.1 by @dependabot[bot] in https://github.com/fluent/fluent-bit/pull/12248
- workflows: bump github/codeql-action/upload-sarif from 4.37.4 to 4.37.6 by @dependabot[bot] in https://github.com/fluent/fluent-bit/pull/12249
- downstream: invalidate TLS session before socket close by @edsiper in https://github.com/fluent/fluent-bit/pull/12278
- out_s3: Address underflow of buffer size on startup by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12266
- compat: Ensure alignment of reading dword width by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12276
- engine_dispatch: Address stale failed tasks on dispatch by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12254
- in_node_exporter_metrics: fix incorrect pointer arithmetic in diskstats metric cache by @ngillen in https://github.com/fluent/fluent-bit/pull/12255
- input_chunk: in_storage_backlog: Display evicted logs on dropping chunks by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12288
- utils: fix SIMD boundary for JSON string encoding by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12285
- stream_processor: sp_stream: Plug unfreed allocated memories on exceptions by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12277
- out_logdna: add hostname as primary field and runtime tests by @agup006 in https://github.com/fluent/fluent-bit/pull/11517
- maintenance: update v5.1 stable status by @edsiper in https://github.com/fluent/fluent-bit/pull/12290
- motd: v5.1 by @edsiper in https://github.com/fluent/fluent-bit/pull/12240
- release: update to 5.1.1 by @github-actions[bot] in https://github.com/fluent/fluent-bit/pull/12238
- out_file: support timestamp placeholder by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12245
- out_splunk: Add auto_extract_timestamp parameter by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12143
- tests: core_routes: Handle limit of rlimit's soft limit by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/11592
- plugin_proxy: add config map to the plugin registration by @iypetrov in https://github.com/fluent/fluent-bit/pull/12058
- input_chunk: fix storage limit eviction with 32 or more outputs by @terrorobe in https://github.com/fluent/fluent-bit/pull/12235
New Contributors
- @iypetrov made their first contribution in https://github.com/fluent/fluent-bit/pull/12058
- @terrorobe made their first contribution in https://github.com/fluent/fluent-bit/pull/12235
Full Changelog: https://github.com/fluent/fluent-bit/compare/v5.1.0...v5.1.1
5.1.0 August 6, 2026 38.9 MB 64-bit EXE (NSIS) 22.7 MB64-bit ZIP 38.9 MBARM64 EXE (NSIS) 21.0 MBARM64 ZIP 37.9 MB32-bit ZIP 36.6 MB32-bit EXE (NSIS) 21.0 MB
5.0.7 June 6, 2026 37.9 MB 64-bit ZIP 37.9 MB64-bit EXE (NSIS) 22.1 MBARM64 EXE (NSIS) 20.5 MBARM64 ZIP 36.4 MB32-bit ZIP 35.4 MB32-bit EXE (NSIS) 20.4 MB
Release notes
https://fluentbit.io/announcements/v5.0.7/
What's Changed
- release: update to 5.0.7 by @github-actions[bot] in #11834
- http_server: serialize worker teardown to prevent race conditions by @cosmo0920 in #11845
- http_server: fix libevent crash on connection drop by @cosmo0920 in #11843
- out_chronicle: Support label and namespace mapping by @cosmo0920 in #11836
- tests: internal: fuzzers: avoid destroying active input fuzzer tasks by @edsiper in #11850
- config_format: fix YAML variant cleanup on parser errors by @edsiper in #11857
- avro: Handle int64 values correctly by @cosmo0920 in #11883
- tests: runtime: Stabilize out_lib test case by @cosmo0920 in #11888
- in_elasticsearch: check map size before accessing first entry by @TristanInSec in #11856
- snappy: fix OOB reads in framed data parser by @TristanInSec in #11855
- zstd: add 100 MB decompression size limit by @TristanInSec in #11854
- in_mqtt: fix OOB read from hardcoded remaining length overhead by @TristanInSec in #11853
- in_collectd: reject parts with length < 4 and fix null-terminator OOB by @TristanInSec in #11849
- in_forward: validate array size before accessing message mode fields by @TristanInSec in #11851
- in_syslog: fix integer overflow in octet-counting length parser by @TristanInSec in #11852
- out_stackdriver: fix multiple memory leaks and potential corruption by @baizhenyu in #11879
- CODEOWNERS: remove @braydonk and @jefferbrecht by @braydonk in #11909
- time: time_tz: Handle conversion rules of windows and IANA tzinfo by @cosmo0920 in #11903
- storage: discard checksum corrupt chunks on startup by @edsiper in #11886
- parser: Add IANA time_zone support for native timestamps by @cosmo0920 in #11913
- workflows: pin all actions to SHA by @patrick-stephens in #11908
- out_kinesis_streams: increase PUT_RECORDS_PAYLOAD_SIZE to 10MB by @ShelbyZ in #11848
- in_stdin: support stdin plugin on windows by @cosmo0920 in #11821
- in_ebpf: Implement dns trace by @cosmo0920 in #11735
- out_s3: Provide options for inactive chunks behavior by @cosmo0920 in #11816
- oauth: out_http: add user-agent option for oauth by @rja5 in #11830
- in_tail: fix offset_key value multiplied by 8 on Windows 64-bit by @zshuang0316 in #11893
- http_client_http2: bracket IPv6 authority hosts by @edsiper in #11922
New Contributors
- @TristanInSec made their first contribution in #11856
- @rja5 made their first contribution in #11830
Full Changelog: https://github.com/fluent/fluent-bit/compare/v5.0.6...v5.0.7

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