CVE-2026-44163 PUBLISHED

fluent-plugin-opentelemetry: Denial of Service (DoS) via Large Payloads and Decompression Bombs in `in_opentelemetry`

Assigner: GitHub_M
Reserved: 05.05.2026 Published: 15.09.2026 Updated: 15.09.2026

fluent-plugin-opentelemetry is a Fluentd input and output plugin for forwarding OpenTelemetry Protocol data. Prior to 0.5.3, the in_opentelemetry HTTP input read the entire incoming request body and decompressed payloads into memory without enforcing maximum size thresholds. When an OpenTelemetry ingestion endpoint was exposed to an untrusted network, an attacker could send an excessively large request or a highly compressed payload that expanded in memory. The resulting memory exhaustion could cause the operating system to terminate the Fluentd process, disrupting all log collection and forwarding on the affected node. This issue is fixed in version 0.5.3.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS Score: 5.3

Product Status

Vendor fluent-plugins-nursery
Product fluent-plugin-opentelemetry
Versions
  • Version < 0.5.3 is affected

References

Problem Types

  • CWE-409: Improper Handling of Highly Compressed Data (Data Amplification) CWE