CVE-2026-33558

MEDIUM

5.3

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.

CVE Details

CVSS v3.1 Score5.3

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published4/20/2026

Last Modified4/22/2026

Sourcenvd

Honeypot Sightings0

Affected Products

apache:kafka

Weaknesses (CWE)

CWE-533

References

https://kafka.apache.org/cve-list(security@apache.org)

https://lists.apache.org/thread/pz5g4ky3h0k91tfd14p0dzqjp80960kl(security@apache.org)

http://www.openwall.com/lists/oss-security/2026/04/17/3(af854a3a-2127-422b-91ae-364da2661108)

IOC Correlations

No correlations recorded

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