Medium 5.3Published Apr 20, 2026

CVE-2026-33558Information exposure vulnerability has been identified in Apache Kafka.

Updated under an hour ago (2026-10-19 06:50 UTC)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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: 5.3 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness (CWE): CWE-533
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Analyzed
Record last updated: Jun 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

apache kafka apache:kafka	from 0.11.0.0 before 3.9.2; 4.0.0; 4.0.0; 4.0.0; 4.0.0	NVD

References

https://kafka.apache.org/cve-listvendor-advisory
https://lists.apache.org/thread/pz5g4ky3h0k91tfd14p0dzqjp80960klmitigation, vendor-advisory
http://www.openwall.com/lists/oss-security/2026/04/17/3mailing-list

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.