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

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. We advise the Kafka users to upgrade to v3.9.2, v4.0.1, or later to avoid this vulnerability.

Affected products and versions

Product Affected versions Fixed in
Apache Kafka 4.0.0 No fix stated
Apache Kafka 0.11 0.11.0 → 3.9.1 No fix stated
Apache Kafka Clients 4.0.0 No fix stated
Apache Kafka Clients 0.11 0.11.0 → 3.9.1 No fix stated

References

Timeline

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Other CVEs of Apache Kafka

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CVE-2026-114349 Apache Kafka: Denial of service via unbounded memory allocation when decoding compressed record batches Not rated CVE-2026-112375 Apache Kafka: Unauthorized principal can read arbitrary broker files via IncrementalAlterConfigs Not rated CVE-2026-116593 Apache Kafka: Kafka Connect configuration provider values exposed via validation REST API endpoint Not rated CVE-2026-115644 Apache Kafka: Connect Admin REST API Authentication Bypass via Unapplied REST Extensions Not rated
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