GitHub Advisoryadvisory · Maven

GHSA-wf66-mphr-4c4r Apache Kafka exposes sensitive information in its DEBUG logs

MEDIUM Published 2026-04-20 Modified 2026-04-24 Official page ↗
Aliases
CVE-2026-33558
Ecosystem
Maven
Packages
org.apache.kafka:kafka-clients
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weaknesses
CWE-532
Reviewed
2026-04-24

Affected packages

• Maven org.apache.kafka:kafka-clients: >= 0.11.0, < 3.9.2 → fixed in 3.9.2 • Maven org.apache.kafka:kafka-clients: >= 4.0.0, < 4.0.1 → fixed in 4.0.1

Description

Information exposure vulnerability has been identified in Apache Kafka. The NetworkClient component will output entire requests and responses information in the DEBUG log level in the logs. By default, the log level is set to INFO level. If the DEBUG level is enabled, the sensitive information will be exposed via the requests and responses output log. The entire lists of impacted requests and responses are: • AlterConfigsRequest • AlterUserScramCredentialsRequest • ExpireDelegationTokenRequest • IncrementalAlterConfigsRequest • RenewDelegationTokenRequest • SaslAuthenticateRequest • createDelegationTokenResponse • describeDelegationTokenResponse • SaslAuthenticateResponse This issue affects Apache Kafka: from any version supported the listed API above through v3.9.1, v4.0.0. Apache advises Kafka users to upgrade to v3.9.2, v4.0.1, or later to avoid this vulnerability.

Related

Alias · CVE (1)

  • CVE-2026-33558 Information exposure vulnerability has been identified in Apache Kafka. vulnerability

Weakness · CWE (1)

  • CWE-532 Insertion of Sensitive Information into Log File weakness

References