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8.1
Strimzi: Incorrect mTLS Configuration with Multistage CA Chain
CVE-2026-27134
Summary
Strimzi incorrectly configures mTLS authentication when using a custom certificate chain. This allows some users to authenticate even if their certificate isn't valid. To fix this, update to version 0.50.1 or provide only the main CA certificate.
What to do
No fix is available yet. Check with your software vendor for updates.
Affected software
| Vendor | Product | Affected versions | Fix available |
|---|---|---|---|
| linuxfoundation | strimzi_kafka_operator | > 0.49.0 , <= 0.50.1 | – |
Original title
Strimzi provides a way to run an Apache Kafka cluster on Kubernetes or OpenShift in various deployment configurations. In versions 0.49.0 through 0.50.0, when using a custom Cluster or Clients CA ...
Original description
Strimzi provides a way to run an Apache Kafka cluster on Kubernetes or OpenShift in various deployment configurations. In versions 0.49.0 through 0.50.0, when using a custom Cluster or Clients CA with a multistage CA chain consisting of multiple CAs, Strimzi incorrectly configures the trusted certificates for mTLS authentication on the internal as well as user-configured listeners. All CAs from the CA chain will be trusted. And users with certificates signed by any of the CAs in the chain will be able to authenticate. This issue affects only users using a custom Cluster or Clients CA with a multistage CA chain consisting of multiple CAs. It does not affect users using the Strimzi-managed Cluster and Clients CAs. It also does not affect users using custom Cluster or Clients CA with only a single CA (i.e., no CA chain with multiple CAs). This issue has been fixed in version 0.50.1. To workaround this issue, instead of providing the full CA chain as the custom CA, users can provide only the single CA that should be used.
nvd CVSS3.1
8.1
Vulnerability type
CWE-287
Improper Authentication
CWE-295
Improper Certificate Validation
CWE-296
- https://github.com/strimzi/strimzi-kafka-operator/releases/tag/0.50.1 Product Release Notes
- https://github.com/strimzi/strimzi-kafka-operator/security/advisories/GHSA-2qwx-... Vendor Advisory
Published: 21 Feb 2026 · Updated: 12 Mar 2026 · First seen: 6 Mar 2026