---
id: CVE-2026-44163
title: >-
  fluent-plugin-opentelemetry is a Fluentd input and output plugin for
  forwarding OpenTelemetry Protocol data
summary: >-
  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 with…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'
cwe:
  - CWE-409
  - CWE-770
vendor: fluent-plugins-nursery
product: fluent-plugin-opentelemetry
affected:
  - fluent-plugin-opentelemetry < 0.5.3
patched:
  - fluent-plugin-opentelemetry 0.5.3
published: '2026-09-15'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T17:17:18.673'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-44163'
references:
  - url: >-
      https://github.com/fluent-plugins-nursery/fluent-plugin-opentelemetry/commit/ce6c1f2a7741592c8a79afbe75fded9e8ebfa92d
    label: security-advisories@github.com
  - url: >-
      https://github.com/fluent-plugins-nursery/fluent-plugin-opentelemetry/security/advisories/GHSA-2jc5-xhx8-qj6h
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-2jc5-xhx8-qj6h'
tags:
  - nvd
  - cve.org
  - ghsa
  - rubygems
ecosystem: rubygems
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-16T16:01:56.034552Z'
ingestedAt: '2026-06-29T13:24:35.296Z'
epss: 0.00418
epssPercentile: 0.33462
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-44163)

Affected packages:

- `fluent-plugin-opentelemetry <= 0.5.2`

Patched in:

- `fluent-plugin-opentelemetry 0.5.3`

Source: https://github.com/advisories/GHSA-2jc5-xhx8-qj6h