CVE-2026-33558

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.

Affected Software

Weaknesses

• CWE-533: CWE-533 DEPRECATED: Information Exposure Through Server Log Files

ADP Enrichment

CVE Program Container

Additional References

• http://www.openwall.com/lists/oss-security/2026/04/17/3

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

References

• https://kafka.apache.org/cve-list
• https://lists.apache.org/thread/pz5g4ky3h0k91tfd14p0dzqjp80960kl

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