{"id":"CVE-2024-50609","aliases":["AZL-57078","AZL-57086","BIT-fluent-bit-2024-50609","EUVD-2025-4694","GHSA-4g89-mg9x-4chc"],"status":"published","title":"An issue was discovered in Fluent Bit 3.1.9. When the OpenTelemetry input plugin is running and...","description":"An issue was discovered in Fluent Bit 3.1.9. When the OpenTelemetry input plugin is running and listening on an IP address and port, one can send a packet with Content-Length: 0 and it crashes the server. Improper handling of the case when Content-Length is 0 allows a user (with access to the endpoint) to perform a remote Denial of service attack. The crash happens because of a NULL pointer dereference when 0 (from the Content-Length) is passed to the function cfl_sds_len, which in turn tries to cast a NULL pointer into struct cfl_sds. This is related to process_payload_traces_proto_ng() at opentelemetry_prot.c.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-12","score":0.01114,"percentile":0.66478,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-476"],"published":"2025-02-18T00:00:00Z","modified":"2026-10-28T02:30:58Z","fixes":[{"ecosystem":"Azure Linux:3","package":"fluent-bit","fixed_in":["3.1.9-3"],"sources":["osv"]},{"ecosystem":"Azure Linux:2","package":"fluent-bit","fixed_in":["3.0.6-2"],"sources":["osv"]},{"ecosystem":"Bitnami","package":"fluent-bit","fixed_in":["3.1.10"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Azure Linux:3","package":"fluent-bit","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.1.9-3"}]}]},{"source":"osv","ecosystem":"Azure Linux:2","package":"fluent-bit","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.6-2"}]}]},{"source":"osv","ecosystem":"Bitnami","package":"fluent-bit","ranges":[{"type":"SEMVER","events":[{"introduced":"3.1.9"},{"fixed":"3.1.10"}]}]}],"products":[{"vendor":"treasuredata","product":"fluent_bit"}],"references":[{"url":"https://fluentbit.io/announcements/","tags":["Product","web"]},{"url":"https://github.com/fluent/fluent-bit/releases","tags":["Release Notes","article","package"]},{"url":"https://www.ebryx.com/blogs/exploring-cve-2024-50608-and-cve-2024-50609","tags":["Exploit","Third Party Advisory","advisory","article"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-50609","tags":["web","advisory"]},{"url":"https://fluentbit.io/announcements"},{"url":"https://github.com/advisories/GHSA-4g89-mg9x-4chc"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/50xxx/CVE-2024-50609.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2024-50609","description":"An issue was discovered in Fluent Bit 3.1.9. When the OpenTelemetry input plugin is running and listening on an IP address and port, one can send a packet with Content-Length: 0 and it crashes the server. Improper handling of the case when Content-Length is 0 allows a user (with access to the endpoint) to perform a remote Denial of service attack. The crash happens because of a NULL pointer dereference when 0 (from the Content-Length) is passed to the function cfl_sds_len, which in turn tries to cast a NULL pointer into struct cfl_sds. This is related to process_payload_traces_proto_ng() at opentelemetry_prot.c.","status":"published","published":"2025-02-18T00:00:00Z","modified":"2025-02-19T14:58:22.328Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"adp"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T14:34:22.153872Z"}],"euvd":[{"id":"EUVD-2025-4694","description":"An issue was discovered in Fluent Bit 3.1.9. When the OpenTelemetry input plugin is running and listening on an IP address and port, one can send a packet with Content-Length: 0 and it crashes the server. Improper handling of the case when Content-Length is 0 allows a user (with access to the endpoint) to perform a remote Denial of service attack. The crash happens because of a NULL pointer dereference when 0 (from the Content-Length) is passed to the function cfl_sds_len, which in turn tries to cast a NULL pointer into struct cfl_sds. This is related to process_payload_traces_proto_ng() at opentelemetry_prot.c.","status":"published","published":"2025-02-18T00:00:00Z","modified":"2025-02-19T14:58:22Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T20:53:27.843209Z"}],"ghsa":[{"id":"GHSA-4g89-mg9x-4chc","title":"An issue was discovered in Fluent Bit 3.1.9. When the OpenTelemetry input plugin is running and...","description":"An issue was discovered in Fluent Bit 3.1.9. When the OpenTelemetry input plugin is running and listening on an IP address and port, one can send a packet with Content-Length: 0 and it crashes the server. Improper handling of the case when Content-Length is 0 allows a user (with access to the endpoint) to perform a remote Denial of service attack. The crash happens because of a NULL pointer dereference when 0 (from the Content-Length) is passed to the function cfl_sds_len, which in turn tries to cast a NULL pointer into struct cfl_sds. This is related to process_payload_traces_proto_ng() at opentelemetry_prot.c.","status":"published","published":"2025-02-18T18:33:21Z","modified":"2025-02-19T15:33:13Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T14:59:59.153661Z"}],"nvd":[{"id":"CVE-2024-50609","description":"An issue was discovered in Fluent Bit 3.1.9. When the OpenTelemetry input plugin is running and listening on an IP address and port, one can send a packet with Content-Length: 0 and it crashes the server. Improper handling of the case when Content-Length is 0 allows a user (with access to the endpoint) to perform a remote Denial of service attack. The crash happens because of a NULL pointer dereference when 0 (from the Content-Length) is passed to the function cfl_sds_len, which in turn tries to cast a NULL pointer into struct cfl_sds. This is related to process_payload_traces_proto_ng() at opentelemetry_prot.c.","status":"published","published":"2025-02-18T18:15:25.833Z","modified":"2026-06-17T08:04:47.89Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T14:10:44.508862Z"}],"osv":[{"id":"CVE-2024-50609","description":"An issue was discovered in Fluent Bit 3.1.9. When the OpenTelemetry input plugin is running and listening on an IP address and port, one can send a packet with Content-Length: 0 and it crashes the server. Improper handling of the case when Content-Length is 0 allows a user (with access to the endpoint) to perform a remote Denial of service attack. The crash happens because of a NULL pointer dereference when 0 (from the Content-Length) is passed to the function cfl_sds_len, which in turn tries to cast a NULL pointer into struct cfl_sds. This is related to process_payload_traces_proto_ng() at opentelemetry_prot.c.","status":"published","published":"2025-02-18T00:00:00Z","modified":"2026-10-28T02:30:58.393976324Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:44.032344Z"},{"id":"AZL-57078","title":"CVE-2024-50609 affecting package fluent-bit for versions less than 3.1.9-3","description":"An issue was discovered in Fluent Bit 3.1.9. When the OpenTelemetry input plugin is running and listening on an IP address and port, one can send a packet with Content-Length: 0 and it crashes the server. Improper handling of the case when Content-Length is 0 allows a user (with access to the endpoint) to perform a remote Denial of service attack. The crash happens because of a NULL pointer dereference when 0 (from the Content-Length) is passed to the function cfl_sds_len, which in turn tries to cast a NULL pointer into struct cfl_sds. This is related to process_payload_traces_proto_ng() at opentelemetry_prot.c.","status":"published","published":"2025-02-18T18:15:25Z","modified":"2026-04-21T04:57:01.680402Z","updated_at":"2026-11-02T15:28:07.209678Z"},{"id":"AZL-57086","title":"CVE-2024-50609 affecting package fluent-bit for versions less than 3.0.6-2","description":"An issue was discovered in Fluent Bit 3.1.9. When the OpenTelemetry input plugin is running and listening on an IP address and port, one can send a packet with Content-Length: 0 and it crashes the server. Improper handling of the case when Content-Length is 0 allows a user (with access to the endpoint) to perform a remote Denial of service attack. The crash happens because of a NULL pointer dereference when 0 (from the Content-Length) is passed to the function cfl_sds_len, which in turn tries to cast a NULL pointer into struct cfl_sds. This is related to process_payload_traces_proto_ng() at opentelemetry_prot.c.","status":"published","published":"2025-02-18T18:15:25Z","modified":"2026-04-21T04:36:50.453081Z","updated_at":"2026-11-02T15:28:07.209678Z"},{"id":"BIT-fluent-bit-2024-50609","description":"An issue was discovered in Fluent Bit 3.1.9. When the OpenTelemetry input plugin is running and listening on an IP address and port, one can send a packet with Content-Length: 0 and it crashes the server. Improper handling of the case when Content-Length is 0 allows a user (with access to the endpoint) to perform a remote Denial of service attack. The crash happens because of a NULL pointer dereference when 0 (from the Content-Length) is passed to the function cfl_sds_len, which in turn tries to cast a NULL pointer into struct cfl_sds. This is related to process_payload_traces_proto_ng() at opentelemetry_prot.c.","status":"published","published":"2025-04-23T08:54:21.818Z","modified":"2026-09-08T08:47:31.965889462Z","updated_at":"2026-11-02T15:28:29.563843Z"}]}}