Advisory [CVE-2026-112375] Apache Kafka: authenticated Kafka principal with no authorization grants (not even ALTER_CONFIGS) can make a broker read a file or an environment variable from the broker host and return its contents
This security Apache Software Foundation advisory covers CVE-2026-112375 affecting Apache Kafka.
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Summary
An authenticated Kafka principal with no authorization grants (not even ALTER_CONFIGS) can make a broker read a file or an environment variable from the broker host and return its contents.
An IncrementalAlterConfigs (or AlterConfigs) request targeting a BROKER resource reaches the broker's configuration validation before any authorization check is applied to that path.
Validation resolves configuration variables such as ${file:/path:key} or ${env:VAR} using a ConfigProvider named in the request, and this resolution bypasses the org.apache.kafka.automatic.config.providers allowlist that was added as the mitigation for CVE-2024-31141.
An arbitrary ConfigProvider (for example FileConfigProvider or EnvVarConfigProvider) is therefore instantiated and the referenced file or environment variable is read, and a type-validation error returns the resolved content to the caller.
Impact:
On a cluster with an authorizer enabled, an authenticated principal with no authorization grants can read the contents of files accessible to the broker process, and the broker's environment variables, exposing credentials, keystores, or other secrets, defeating the CVE-2024-31141 allowlist. The read is bounded by the broker process's file permissions.
The brokers and the cluster remain available; the issue is disclosure of file and environment- variable contents.
- Apache Kafka 3.2.0 through 4.1.2
- Apache Kafka 4.2.0 through 4.2.1
- Apache Kafka 4.3.0 through 4.3.1
Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source
- 4.2.2
- 4.3.2
- 4.4.0
Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source
Mitigation checklist
- Mitigation: Upgrade to Apache Kafka 4.2.2, 4.3.2, or 4.4.0.
Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source
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