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CVE-2026-44163
Published:September 15, 2026
Updated:September 22, 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.
Affected Packages
https://github.com/fluent-plugins-nursery/fluent-plugin-opentelemetry.git (GITHUB):
Affected version(s) >=v0.1.0 <v0.5.3
Fix Suggestion:
Update to version v0.5.3
fluent-plugin-opentelemetry (RUBY):
Affected version(s) >=0.1.0 <0.5.3
Fix Suggestion:
Update to version 0.5.3
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CVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Weakness Type (CWE)
Allocation of Resources Without Limits or Throttling
Improper Handling of Highly Compressed Data (Data Amplification)
EPSS
Base Score:
0.34