What is CVE-2026-33558?

CVE-2026-33558 is a medium-severity vulnerability in Apache Kafka, classified under CWE-533. CVSS score: 5.3/10. Published 2026-04-20.

How severe is CVE-2026-33558?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Apache Kafka

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 default, the log level is set to INFO level…

EPSS: 0.005 (41.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

Apache Kafka — versions 4.0.0
Apache Software Foundation Kafka — versions 0.11.0, 4.0.0
Apache Software Foundation Kafka Clients — versions 0.11.0, 4.0.0

Weakness classification (CWE)

CWE-533

References

security@apache.org (vendor-advisory, Vendor Advisory)
security@apache.org (Vendor Advisory, mailing-list, Mitigation)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List)

Frequently asked questions

What is CVE-2026-33558?: CVE-2026-33558 is a medium-severity vulnerability in Apache Kafka, classified under CWE-533. CVSS score: 5.3/10. Published 2026-04-20.
How severe is CVE-2026-33558?: Medium severity. CVSS v3 base score is 5.3 out of 10.