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GHSA-22xc-xg2r-9j7v

HighCVSS 7.4 / 10
Published Jul 16, 2026·Last modified Jul 16, 2026
Affected Components(0)

No affected components available

Description

Impact

When Envoy Gateway runs in GatewayNamespaceMode (provider.kubernetes.deploy.type=GatewayNamespace), the xDS gRPC server is configured with a StreamInterceptor for JWT authentication but no UnaryInterceptor. The go-control-plane xDS server exposes both streaming and unary (Fetch) RPC methods for all registered discovery services. Since there is no unary interceptor, these Fetch endpoints are completely unauthenticated.

Additionally, the JWT authentication interceptor in GatewayNamespaceMode only validates tokens when the received gRPC message is of type discoveryv3.DeltaDiscoveryRequest . If the message is a discoveryv3.DiscoveryRequest — used by the State-of-the-World (SotW) xDS protocol — the type assertion fails, the validation block is skipped entirely, and RecvMsg returns nil (success) without any authentication.

Any pod in the cluster that can reach the xDS server (port 18000) can use the SotW protocol to bypass JWT authentication and access:

  • TLS private keys via StreamSecrets (SDS)
  • All xDS resources via StreamAggregatedResources (ADS)
  • Backend endpoints via StreamClusters / StreamEndpoints (CDS/EDS)
  • Routing rules via StreamRoutes / StreamListeners (RDS/LDS)

Credits

Envoy Gateway thanks @dashingDragon and @Donjon-Cerberus for reporting this issue.

Risk Scores
Base Score
7.4

The vulnerability can be exploited over a local network, such as Wi-Fi. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The vulnerability can affect other systems as well, not just the initial system. There is a high impact on the confidentiality of the information.

Threat Intelligence
6.8

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
N/A

Probability that this vulnerability will be exploited in the wild within the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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High severity
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