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CVE-2026-33558

Apache Kafka, Apache Kafka Clients: Information Exposure Through Network Client Log Output

Published: Apr 20, 2026Updated: Apr 20, 2026 Sources: CVE List NVD
NVD MITRE
5.3CVSS
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 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.

EPSS Score
N/A
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:LI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None

Weaknesses

CWE-533

Affected Products

Apache Kafka
Apache Software Foundation
Apache Kafka Clients
Apache Software Foundation

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

References

https://kafka.apache.org/cve-list
kafka.apache.org
https://lists.apache.org/thread/pz5g4ky3h0k91tfd14p0dzqjp80960kl
lists.apache.org
http://www.openwall.com/lists/oss-security/2026/04/17/3
openwall.com

Timeline

Published
Apr 20, 2026
Last Updated
Apr 20, 2026

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