CVE-2026-33558

5.3 MEDIUM
Published: April 20, 2026 Modified: April 22, 2026
View on NVD

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.

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://kafka.apache.org/cve-list
Source: security@apache.org
Vendor Advisory
https://lists.apache.org/thread/pz5g4ky3h0k91tfd14p0dzqjp80960kl
Source: security@apache.org
Mitigation Vendor Advisory
http://www.openwall.com/lists/oss-security/2026/04/17/3
Source: af854a3a-2127-422b-91ae-364da2661108
Mailing List

3 reference(s) from NVD

Quick Stats

CVSS v3 Score
5.3 / 10.0
EPSS (Exploit Probability)
0.5%
41th percentile
Exploitation Status
Not in CISA KEV

Weaknesses (CWE)

Affected Vendors

apache