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.

🗓️ 04 Mar 2025 08:00:00Reported by MicrosoftType

Fluent Bit 3.1.9 OpenTelemetry input crashes with Content-Length: 0, causing remote denial of service via null pointer dereference.

Reporter	Title	Published	Views	Family All 27
Tenable Nessus	Azure Linux 3.0 Security Update: fluent-bit (CVE-2024-50609)	20 Mar 202500:00	–	nessus
Tenable Nessus	Fluent Bit Multiple Vulnerabilities	27 Feb 202500:00	–	nessus
Tenable Nessus	CBL Mariner 2.0 Security Update: fluent-bit (CVE-2024-50609)	3 Mar 202500:00	–	nessus
CBLMariner	CVE-2024-50609 affecting package fluent-bit for versions less than 3.1.9-3	13 Mar 202515:10	–	cbl_mariner
CBLMariner	CVE-2024-50609 affecting package fluent-bit for versions less than 3.0.6-2	3 Mar 202522:12	–	cbl_mariner
Circl	CVE-2024-50609	18 Feb 202518:16	–	circl
CNNVD	Fluent Bit 安全漏洞	18 Feb 202500:00	–	cnnvd
CNNVD	Fluent Bit 安全漏洞	18 Feb 202500:00	–	cnnvd
CVE	CVE-2024-50609	18 Feb 202500:00	–	cve
Cvelist	CVE-2024-50609	18 Feb 202500:00	–	cvelist