An issue in fluent-bit v.3.7.2 allows a local attacker to cause a denial of service via the function consume_event.

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

• treasuredata fluent bitall versions

Other highest-scoring records for the same primary product.

• CVE-2024-4323Fluent Bit Memory Corruption Vulnerability
  47Plan
• CVE-2021-36088Fluent Bit (aka fluent-bit) 1.7.0 through 1.7.4 has a double free in flb_free (called from flb_parser_json_do and flb_parser_do).
  40Plan
• CVE-2025-12977Fluent Bit in_http, in_splunk, and in_elasticsearch input plugins fail to sanitize tag_key inputs.
  36Monitor
• CVE-2025-12970The extract_name function in Fluent Bit in_docker input plugin copies container names into a fixed size stack buffer without validating leng
  35Monitor
• CVE-2021-46879An issue was discovered in Treasure Data Fluent Bit 1.7.1, a wrong variable is used to get the msgpack data resulting in a heap overflow in
  31Monitor
• CVE-2021-46878An issue was discovered in Treasure Data Fluent Bit 1.7.1, erroneous parsing in flb_pack_msgpack_to_json_format leads to type confusion bug
  31Monitor

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Root cause

Code that parses nested structures sets no depth or size limit. A small input can turn into a disproportionate processing load.

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

1function expand(node) {2  return node.children.map(expand);3}

1const MAX_DEPTH = 32;2function expand(node, depth = 0) {3  if (depth > MAX_DEPTH) throw new Error("too deep");4  return node.children.map((c) => expand(c, depth + 1));5}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.