Kubernetes Secrets Vulnerability in External Secrets Operator by External Secrets
CVE-2026-42875

5.3MEDIUM

Key Information:

Vendor

External-secrets

Status
External-secrets
Vendor
CVE Published:
11 May 2026

What is CVE-2026-42875?

The External Secrets Operator, utilized for managing secrets in Kubernetes, is vulnerable due to improper handling of Namespaced SecretStore resources prior to version 2.4.0. When configured with CAProvider using the type ConfigMap, it allowed the resolution of Certificate Authority (CA) materials from other namespaces if the caProvider.namespace was set. This flaw compromised the namespace isolation principle, potentially leading to unauthorized access to sensitive information across namespaces. The issue has been addressed in version 2.4.0, ensuring adherence to the namespace boundary.

Affected Version(s)

external-secrets < 2.4.0

References

https://github.com/external-secrets/external-secrets/secu...
x_refsource_CONFIRM

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.