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CVE-2026-42875— External Secrets Operator: Namespace Isolation Bypass in CAProvider ConfigMap Resolution for SecretStore

Quick assessment

Affected
external-secrets external-secrets
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

External Secrets是External Secrets开源的一个 Kubernetes 相关应用程序。 External Secrets 2.4.0之前版本存在授权问题漏洞，该漏洞源于命名空间SecretStore资源使用CAProvider时，可解析其他命名空间的CA材料，绕过命名空间边界。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.24% · P15

Possible ATT&CK Techniques 1 AI

T1552.004 · Private Keys

Affected Version Matrix 1

VendorProduct Version RangeStatus
external-secrets external-secrets < 2.4.0 affected
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I. Basic Information for CVE-2026-42875

Vulnerability Information
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Vulnerability Title
External Secrets Operator: Namespace Isolation Bypass in CAProvider ConfigMap Resolution for SecretStore
Source: CVE Program / CVE List V5
Vulnerability Description
External Secrets Operator reads information from a third-party service and automatically injects the values as Kubernetes Secrets. Prior to 2.4.0, Namespaced SecretStore resources that used CAProvider with type ConfigMap could resolve CA material from another namespace when caProvider.namespace was set. This bypassed the namespace boundary enforced for SecretStore-backed references in providers that rely on the shared runtime CA resolver. This vulnerability is fixed in 2.4.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
External Secrets 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
External Secrets是External Secrets开源的一个 Kubernetes 相关应用程序。 External Secrets 2.4.0之前版本存在授权问题漏洞，该漏洞源于命名空间SecretStore资源使用CAProvider时，可解析其他命名空间的CA材料，绕过命名空间边界。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
external-secrets external-secrets < 2.4.0 -

II. Public POCs for CVE-2026-42875

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III. Intelligence Information for CVE-2026-42875

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Vendor Advisories for CVE-2026-42875 (1)

IV. Related Vulnerabilities

Same product: external-secrets
Same vendor: external-secrets
Same weakness: CWE-285

V. Comments for CVE-2026-42875

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