CVE-2026-54495 Cross-namespace FeatureFlagSource and InProcessConfiguration resolution exposes spec contents on multi-tenant clusters
A tenant can read sensitive configuration data from other namespaces by referencing cross-namespace resources in multi-tenant clusters.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-54495?
CVE-2026-54495 is a medium-severity vulnerability in open-feature-operator, published on 17 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The OpenFeature Operator allows users to expose feature flags to applications. In version 0.9.2 and earlier, a tenant who can create a controller-owned workload can use the openfeature.dev/featureflagsource annotation with NAMESPACE/NAME syntax to reference a FeatureFlagSource or InProcessConfiguration in another namespace. On multi-tenant clusters that use namespaces as trust boundaries, the cluster-scoped operator reads that resource and materializes spec.envVars literal values, spec.httpSyncBearerToken, sync URIs, and supporting ConfigMaps into the tenant's workload. Single-tenant clusters are not impacted, secretKeyRef and configMapKeyRef values remain namespace-local, and creating a FeatureFlagSource is not required.
Weakness: CWE-668
Which versions are affected by CVE-2026-54495?
3 open source packages ship an affected version, including github.com/open-feature/open-feature-operator.
| Package | Affected | Fixed in |
|---|---|---|
github.com/open-feature/open-feature-operator Go | All versions | None |
github.com/open-feature/open-feature-operator Go | All versions to 0.9.2 | None |
github.com/open-feature/open-feature-operator Go | All versions to 0.9.2 | None |
How do I fix CVE-2026-54495?
Upgrade to a fixed version.
Is CVE-2026-54495 being exploited?
There is no known exploitation of CVE-2026-54495 in the wild and no public exploit code.
Sources
Also known as GHSA-398h-7f66-3h4p, GO-2026-5998.