CVE-2026-54680

Received Received - Intake

Logging Operator FluentRender Command Injection Vulnerability

Publication date: 2026-07-29

Last updated on: 2026-07-30

Assigner: GitHub, Inc.

Description

Logging operator automates the deployment and configuration of Kubernetes logging pipelines. Prior to 6.6.0, the Fluentd configuration renderer FluentRender in pkg/sdk/logging/model/render/fluent.go writes CRD strings such as Flow record_transformer.records values directly into fluent.conf without escaping, allowing a user who can create Flow resources to inject a Fluentd <match **> block using @type exec and execute arbitrary commands inside the Fluentd aggregator. This issue is fixed in version 6.6.0.

CVSS Scores

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Meta Information

Published

2026-07-29

Last Modified

2026-07-30

Generated

2026-08-19

AI Q&A

2026-07-30

EPSS Evaluated

2026-08-18

NVD

CVE-2026-54680

Affected Vendors & Products

Vendor	Product	Version / Range
fluentd	fluentd	6.6.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-77	The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.
CWE-74	The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.

Attack-Flow Graph

Executive Summary

This vulnerability affects the Logging operator for Kubernetes. It allows a user who can create Flow resources to inject malicious Fluentd configuration that executes arbitrary commands inside the Fluentd aggregator. The issue occurs because the FluentRender component does not properly escape CRD strings when writing to fluent.conf.

Detection Guidance

Check the version of Logging Operator installed. If it is below 6.6.0, the system is vulnerable. Run: kubectl get pods -n <namespace> -l app.kubernetes.io/instance=<logging-operator> -o jsonpath='{.items[*].spec.containers[*].image}' | grep -i logging-operator. Compare the version against 6.6.0.

Impact Analysis

If exploited, this vulnerability could allow an attacker with Flow resource creation privileges to run arbitrary commands on the Fluentd aggregator. This could lead to data breaches, unauthorized access to logs, or compromise of the logging infrastructure.

Compliance Impact

This vulnerability could impact compliance by allowing unauthorized access to sensitive log data, potentially violating GDPR's data protection requirements or HIPAA's confidentiality rules. Unauthorized command execution may also lead to audit failures.

Mitigation Strategies

Upgrade Logging Operator to version 6.6.0 or later immediately. Apply the latest patch to prevent command injection via Flow resources. Restrict access to create or modify Flow resources to trusted users only.

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