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External Secrets Operator: Namespace Isolation Bypass in CAProvider ConfigMap Resolution for SecretStore

CVSS 4.0 5.3 MEDIUMEUVD CVSS 4.0 5.3 CVSS 4.0 · [email protected] · Secondary 5.3 MEDIUMCVSS_V4 Publisher rating MODERATEFixed by github.com/external-secrets/external-secrets 2.4.0osv · severity unknownKEV status unknown

cve-program · CVE-2026-42875

Published

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.

Read the publisher's advisory

euvd · EUVD-2026-29190

Published

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.

Read the publisher's advisory

nvd · CVE-2026-42875

Published

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.

Read the publisher's advisory

osv · GHSA-wv26-88m5-6h59

Published

### Impact 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. The accessible data is used as CA validation material, hence it is not directly exposed. Impact: - Direct data exfiltration risk: low - Existence disclosure: an attacker can infer whether a target ConfigMap/key exists in another namespace. - Trust-boundary violation: a tenant can make its SecretStore consume CA material owned by another namespace.

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osv · GO-2026-5723

Published

External Secrets Operator has Namespace Isolation Bypass in CAProvider ConfigMap Resolution for SecretStore in github.com/external-secrets/external-secrets. NOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions. (If this is causing false-positive reports from vulnerability scanners, please suggest an edit to the report.) The additional affected modules and versions are: github.com/external-secrets/external-secrets before v2.4.0.

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Affected versions, risk and source history

Exploitation and risk

Source status

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Risk history

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Advisory history

13 saved versions

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13 Nov 2026 23:09:39 UTC

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 ma…

euvd · EUVD-2026-29190 · Published

11 Nov 2026 11:06:57 UTC

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 ma…

euvd · EUVD-2026-29190 · Published

9 Nov 2026 10:14:21 UTC

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 ma…

euvd · EUVD-2026-29190 · Published

7 Nov 2026 09:36:06 UTC

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 ma…

euvd · EUVD-2026-29190 · Published

5 Nov 2026 09:04:08 UTC

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 ma…

euvd · EUVD-2026-29190 · Published

3 Nov 2026 08:08:47 UTC

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 ma…

euvd · EUVD-2026-29190 · Published

1 Nov 2026 07:15:07 UTC

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 ma…

euvd · EUVD-2026-29190 · Published

30 Oct 2026 06:59:17 UTC

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 ma…

euvd · EUVD-2026-29190 · Published

28 Oct 2026 05:15:42 UTC

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 ma…

euvd · EUVD-2026-29190 · Published

25 Oct 2026 10:17:15 UTC

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 ma…

nvd · CVE-2026-42875 · Published

24 Oct 2026 13:19:41 UTC

External Secrets Operator has Namespace Isolation Bypass in CAProvider ConfigMap Resolution for SecretStore

osv · GHSA-wv26-88m5-6h59 · Published

24 Oct 2026 13:19:41 UTC

External Secrets Operator has Namespace Isolation Bypass in CAProvider ConfigMap Resolution for SecretStore in github.com/external-secrets/external-secrets

osv · GO-2026-5723 · Published

23 Oct 2026 15:48:27 UTC

External Secrets Operator: Namespace Isolation Bypass in CAProvider ConfigMap Resolution for SecretStore

cve-program · CVE-2026-42875 · Published

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Sources read 15 Nov 23:13 UTC · 274 of 275 readable · 250 fully read · 18 waiting for GitHub's hourly limit · documentation 461/469 current