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Severe, 6 weeks1496Projects326

1496 severe, 6 weeks · 326 projects

Apache KafkaGHSA-wf66-mphr-4c4r

Apache Kafka exposes sensitive information in its DEBUG logs

Apache Kafka

CVE-2026-33558 · Published Apr 20, 2026 · updated Sep 10, 2026

Medium5.3
Fix: upgrade to 3.9.2 or later (2 fixed versions below)
GitHub advisory

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.

Affected versions

PackageAffectedFixed in
org.apache.kafka:kafka-clients
Maven
>= 0.11.0, < 3.9.23.9.2
>= 4.0.0, < 4.0.14.0.1
Details and references
CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Severity from
GitHub (reviewed advisory)
Weakness
CWE-532
Also known as
BIT-kafka-2026-33558, CVE-2026-33558

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