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CVE-2026-33558GHSA-WF66-MPHR-4C4RBIT-KAFKA-2026-33558

Apache Kafka, Apache Kafka Clients: Information Exposure Through Network Client Log Output

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 3.9.2, 4.0.1
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: yes
  • Technical impact: partial

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: yes · Technical impact: partial

  3. Record last updated

Affected versions

  • Apache Software Foundation Apache Kafka

    From 0.11.0 · through 3.9.1

  • org.apache.kafka:kafka-clients

    From 0.11.0 · through 3.9.1

  • org.apache.kafka:kafka-clientsMaven

    From 0.11.0 · fixed in 3.9.2

  • org.apache.kafka:kafka-clientsMaven

    From 4.0.0 · fixed in 4.0.1

References 2

kafka.apache.org

lists.apache.org