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TI-2026-21584 Aliases CVE-2026-27134

Strimzi: All CAs from a custom CA chain consisting of multiple CAs are trusted for mTLS user autentication

Priority LOW 37CWE-287Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
Security bypass, Spoofing
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 2 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-287 and CWE-295.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00387 32nd percentileScored 2026-11-07
Fix Partial strimzi-kafka-operator (strimzi): 0.50.1Red Hat: 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
backstagestrimzi-kafka-operator0.49.0 to before 0.50.10.50.1Patch availableCNA
  • strimzi-kafka-operator Vendorbackstage Affected 0.49.0 to before 0.50.1 Fixed in 0.50.1 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:linuxfoundation:strimzi_kafka_operator:*:*:*:*:*:*:*:*0.49.0 to before 0.50.1Vulnerablebackstage
  • cpe:2.3:a:linuxfoundation:strimzi_kafka_operator:*:*:*:*:*:*:*:* Versions 0.49.0 to before 0.50.1 Vulnerable ·backstage

Remediation

  • Fix · CNA strimzi-kafka-operator (strimzi) Fixed in 0.50.1

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
streams for Apache Kafka 2AffectedNo fix yet
streams for Apache Kafka 3AffectedNo fix yet
Not affected: 2 products
  • streams for Apache Kafka 2
  • streams for Apache Kafka 3

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-27134

References

Advisory 1

Other 1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences