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CVE-2026-33558

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

Published: Apr 20, 2026Updated: Apr 22, 2026 Sources: CVE List NVDCWE-533
NVD MITRE
5.3CVSSMEDIUM
EPSS Score
0.5%
Top 59.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 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
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Weaknesses

CWE-533

Affected Products

kafkaapache
On-premDatabase
Databases / cache-message-queue
Apache KafkaApache Software Foundation
On-premDatabase
Databases / cache-message-queue
Apache Kafka ClientsApache Software Foundation
Mixed
Web & CMS Plugins / cms-core
apacheoss-projectUSWeb & CMS Pluginsaka apache http server, apache httpd
apache software foundationoss-projectUSWeb & CMS Pluginsaka apache foundation

Exploitability

Official Patch Available
Workaround Available

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 22, 2026

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