CVE catalog
CVE-2026-33558
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 defaul
- Severity
- Medium · CVSS 5.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.63% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Cpe | kafka | Not reported | 3.9.2 | fixed |
| Cpe | kafka | Not reported | Not reported | unknown |
| Ubuntu | kafka | pro | 2.2.0u2-0ubuntu3.1 | vulnerable |
| Ubuntu | kafka | pro | 2.2.0u2-0ubuntu3.2 | vulnerable |
| Ubuntu | kafka | pro | 2.2.2u1-0ubuntu1+esm2 | vulnerable |
| Cpe | kafka | Not reported | Not reported | unknown |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Cpe | kafka | cpe | Not reported | 3.9.2 | Not reported | Not reported | Not reported |
OpenFactory catalog packages
No matching packages in this catalog.
Observed:
References
- [http://www.openwall.com/lists/oss-security/2026/04/17/3]
- [https://kafka.apache.org/cve-list]
- [https://lists.apache.org/thread/pz5g4ky3h0k91tfd14p0dzqjp80960kl]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-33558]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-33558]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-1166.json]
[CERT-Bund public advisories] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database]