Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-33558— Apache Kafka, Apache Kafka Clients: Information Exposure Through Network Client Log Output

Quick assessment

Affected
Apache Software Foundation Apache Kafka
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apache Kafka是美国阿帕奇（Apache）基金会的一套开源的分布式流媒体平台。该平台能够获取实时数据，用于构建对数据流的变化进行实时反应的应用程序。 Apache Kafka 3.9.1及之前版本和4.0.0及之前版本存在安全漏洞，该漏洞源于NetworkClient组件在DEBUG日志级别输出敏感请求和响应信息，可能导致信息泄露。

AI Predicted 5.3 Difficulty: Trivial EPSS 0.89% · P58

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-33558

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Apache Kafka, Apache Kafka Clients: Information Exposure Through Network Client Log Output
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-533
Source: CVE Program / CVE List V5
Vulnerability Title
Apache Kafka 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache Kafka是美国阿帕奇（Apache）基金会的一套开源的分布式流媒体平台。该平台能够获取实时数据，用于构建对数据流的变化进行实时反应的应用程序。 Apache Kafka 3.9.1及之前版本和4.0.0及之前版本存在安全漏洞，该漏洞源于NetworkClient组件在DEBUG日志级别输出敏感请求和响应信息，可能导致信息泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache Kafka 0.11.0 ~ 3.9.1 -
Apache Software Foundation Apache Kafka Clients 0.11.0 ~ 3.9.1 -

II. Public POCs for CVE-2026-33558

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-33558

请登录查看更多情报信息。

Mailing List Discussions for CVE-2026-33558 (1)

Same Patch Batch · Apache Software Foundation · 2026-04-20 · 3 CVEs total

CVE-2025-66335 Apache Doris MCP Server: MCP SQL inject
CVE-2026-33557 Apache Kafka: Missing JWT token validation in OAUTHBEARER authentication

IV. Related Vulnerabilities

Same product: Apache Kafka
Same vendor: Apache Software Foundation

V. Comments for CVE-2026-33558

No comments yet

Leave a comment