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CVE-2026-27134

Linuxfoundation Strimzi Kafka Operator authentication bypass

8.1 HIGHEPSS 0.42%
  1. Published20 Feb 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityHigh
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Linuxfoundation Strimzi Kafka Operator≥ 0.49.0 < 0.50.1

Remediation

Fixed in
Linuxfoundation Strimzi Kafka Operator≥ 0.50.1

References

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Frequently asked

Is CVE-2026-27134 being actively exploited?

CVE-2026-27134 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.42%.

How severe is CVE-2026-27134?

CVE-2026-27134 has a CVSS 3.1 base score of 8.1, rated high. EPSS estimates a 0.42% probability of exploitation.

Which products are affected by CVE-2026-27134?

Affected products include Linuxfoundation Strimzi Kafka Operator.

How do I fix CVE-2026-27134?

Upgrade affected software to a fixed version, for example Linuxfoundation Strimzi Kafka Operator 0.50.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.