GitHub Advisoryadvisory · Maven
GHSA-wf66-mphr-4c4r Apache Kafka exposes sensitive information in its DEBUG logs
MEDIUM
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