Home/CVE/Information exposure vulnerability has been identified in Apache Kafka. The NetworkClient component will output entire
CVE

CVE-2026-33558

Information exposure vulnerability has been identified in Apache Kafka. The NetworkClient component will output entire

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.

MEDIUM · CVSS 5.3 EPSS 0.00169
Schedule remediation
  • SSVC automatable: yes - attacks can be scripted at scale
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-533DEPRECATED: Information Exposure Through Server Log Files
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Affected Products & Versions

2
apache kafka>= 0.11.0.0 and < 3.9.2
apache kafkaall versions
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Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
Maven org.apache.kafka:kafka-clients MODERATE fixed in 3.9.2
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Scoring & Timeline

5.3
MEDIUM · CVSS v3.1 · security@apache.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD20 Apr 2026 · 02:16 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
🔗

References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://kafka.apache.org/cve-listVendor Advisory
https://lists.apache.org/thread/pz5g4ky3h0k91tfd14p0dzqjp80960klMitigationVendor Advisory
http://www.openwall.com/lists/oss-security/2026/04/17/3Mailing List
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