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CVE-2026-33558

5.3 medium SSVC exploitation: none Analyzed
NVD · CVE.org

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.

Fix

Patch, vendor advisory and mitigation references on NVD 2

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 5.3 · apacheNVD modified 2026-10-26 21:10

Affected (CPE criteria) 5

  • cpe:2.3:a:apache:kafka:*:*:*:*:*:*:*:*
  • cpe:2.3:a:apache:kafka:4.0.0:-:*:*:*:*:*:*
  • cpe:2.3:a:apache:kafka:4.0.0:rc0:*:*:*:*:*:*
  • cpe:2.3:a:apache:kafka:4.0.0:rc1:*:*:*:*:*:*
  • cpe:2.3:a:apache:kafka:4.0.0:rc3:*:*:*:*:*:*

References 3