CVE-2026-128065
Received Received - Intake

XDS RBAC Policy Bypass in @grpc/grpc-js-xds

Publication date: 2026-11-13

Last updated on: 2026-11-13

Assigner: GitHub, Inc.

Description
@grpc/grpc-js implements the core functionality of gRPC purely in JavaScript, without a C++ addon. From 1.14.0 through 1.14.1, XdsServer in @grpc/grpc-js-xds can acknowledge Route and VirtualHost resources while failing to apply their RBACPerRoute override configurations. The override parser is not registered under the override message type, override maps are stored under a type URL instead of the configured HTTP filter name, and VirtualHost override maps are not read. When experimental RBAC is enabled and a trusted xDS control plane supplies a broad top-level ALLOW policy with a stricter matching override, affected servers evaluate RPCs under the broad policy and can accept requests that should be denied. This issue is fixed in version 1.14.2.

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Meta Information

Published
2026-11-13
Last Modified
2026-11-13
Generated
2026-11-13
AI Q&A
2026-11-13
EPSS Evaluated
N/A
NVD
CVE-2026-128065

Affected Vendors & Products

Showing 5 associated CPEs
Vendor Product Version / Range
grpc grpc-js 1.14.0
grpc grpc-js 1.14.1
grpc grpc-js-xds 1.14.0
grpc grpc-js-xds 1.14.1
grpc grpc-js-xds From 1.14.0 (inc) to 1.14.1 (inc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-863 The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

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Executive Summary

CVE-2026-128065 affects @grpc/grpc-js-xds versions 1.14.0 to 1.14.1. The XdsServer fails to apply RBACPerRoute overrides from Route or VirtualHost resources. When a trusted xDS control plane provides a broad top-level ALLOW policy with a stricter override, the server acknowledges the resources but evaluates RPCs under the broad policy instead of the stricter override. This happens because override configurations are stored by type URL instead of filter name and VirtualHost overrides are not read at all.

Detection Guidance

To detect this vulnerability, check the installed version of @grpc/grpc-js-xds. If the version is between 1.14.0 and 1.14.1, the system is vulnerable. Run: npm list @grpc/grpc-js-xds or npm ls @grpc/grpc-js-xds to verify the installed version.

Impact Analysis

This vulnerability allows unauthorized access to protected handlers. If experimental RBAC is enabled and a trusted xDS control plane supplies a broad top-level policy with stricter route-specific overrides, affected servers may accept requests that should be denied. This could lead to data breaches or unauthorized actions on the server.

Compliance Impact

This vulnerability could lead to unauthorized data access, violating GDPR's data protection principles and HIPAA's access control requirements. Non-compliance may result in legal penalties, data breaches, and loss of trust in systems handling sensitive data.

Mitigation Strategies

Upgrade @grpc/grpc-js-xds to version 1.14.2 or later immediately. Use: npm install @grpc/grpc-js-xds@latest or npm update @grpc/grpc-js-xds to apply the fix.

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