CVE Catalog

CVE-2026-44163

MediumCVSS 5.3
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.42%

34th percentile - higher than 34% of all known CVEs

Summary

fluent-plugin-opentelemetry 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.

Risk Assessment

An attacker can cause memory exhaustion and termination of the Fluentd process, leading to loss of log collection and forwarding on the affected node.

Recommendation

Upgrade fluent-plugin-opentelemetry to version 0.5.3 or later and consider restricting network access to OpenTelemetry ingestion endpoints.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS