CVE-2026-42875 Details
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.
A vulnerability exists in External Secrets Operator versions prior to 2.4.0, allowing Namespaced SecretStore resources that utilized CAProvider with type ConfigMap to improperly resolve CA material from another namespace. This issue arose when caProvider.namespace was configured to point to a different namespace, bypassing the intended namespace boundaries. As a result, a tenant could make its SecretStore access CA material from another namespace, violating trust boundaries and potentially allowing inference about the existence of specific ConfigMaps or keys in the targeted namespace.
Users can upgrade to External Secrets Operator version 2.4.0 or later to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed May 11, 2026CISA-ADP
Assessed May 12, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/external-secrets/external-secrets/security/advisories/GHSA-wv26-88m5-6h59 | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-285 | Improper Authorization | [email protected] |
| CWE-668 | Exposure of Resource to Wrong Sphere | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| External Secrets Operator | < 2.4.0 (semver) |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 11, 2026 | New CVE Received | [email protected] |