What is CVE-2026-15911?

CVE-2026-15911 is a high-severity vulnerability in Confluent Confluent-Kafka, classified under Improper Certificate Validation. CVSS score: 7.4/10. Published 2026-10-01.

How severe is CVE-2026-15911?

High severity. CVSS v3 base score is 7.4 out of 10.

Vulnerability in Confluent Confluent-Kafka

CVE-2026-15911

Confluent Kafka Python client's HashiCorp Vault KMS integration could allow a remote attacker to obtain sensitive information due to improper TLS certificate validation.

Vulnerability class: Improper Certificate Validation

Published 2026-10-01 · last modified 2026-10-01.

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Confluent Confluent-Kafka

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

References

support.confluent.io/hc/en-us/articles/54133146724244-CONFSA-2026-22-CVE-2026-1… (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-15911?: CVE-2026-15911 is a high-severity vulnerability in Confluent Confluent-Kafka, classified under Improper Certificate Validation. CVSS score: 7.4/10. Published 2026-10-01.
How severe is CVE-2026-15911?: High severity. CVSS v3 base score is 7.4 out of 10.