Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Apache | Kafka | >= 0.11.0.0, < 3.9.2 |
Related Weaknesses (CWE)
References
- https://kafka.apache.org/cve-listVendor Advisory
- https://lists.apache.org/thread/pz5g4ky3h0k91tfd14p0dzqjp80960klMitigationVendor Advisory
- http://www.openwall.com/lists/oss-security/2026/04/17/3Mailing List
FAQ
What is CVE-2026-33558?
CVE-2026-33558 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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 defaul...
How severe is CVE-2026-33558?
CVE-2026-33558 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-33558?
Check the references section above for vendor advisories and patch information. Affected products include: Apache Kafka.