CVE-2026-42875— External Secrets Operator: Namespace Isolation Bypass in CAProvider ConfigMap Resolution for SecretStore
Possible ATT&CK Techniques 1AI
T1552.004 · Private KeysAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
授权机制不恰当
Source: NVD (National Vulnerability Database)
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
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-42875 (1)
IV. Related Vulnerabilities
Same product: external-secrets
- CVE-2026-42876
External Secrets Operator: Priviledge escalation with secret - CVE-2026-34984
External Secrets Operator has DNS exfiltration via getHostBy - CVE-2026-22822
External Secrets Operator insecurely retrieves secrets throu - CVE-2025-62159
External Secrets Operator's BeyondTrust Provider has Insecur - CVE-2025-55196
External Secrets Operator Missing Namespace Restriction in P
Same vendor: external-secrets
- CVE-2026-42876
External Secrets Operator: Priviledge escalation with secret - CVE-2026-34984
External Secrets Operator has DNS exfiltration via getHostBy - CVE-2026-22822
External Secrets Operator insecurely retrieves secrets throu - CVE-2025-62159
External Secrets Operator's BeyondTrust Provider has Insecur - CVE-2025-55196
External Secrets Operator Missing Namespace Restriction in P
Same weakness: CWE-285
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V. Comments for CVE-2026-42875
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