# CVE-2026-101914: gRPC grpc-js incorrect authorization in RBAC path matching

Source: https://junglewise.ai/threats/cve-2026-101914-grpc-grpc-js-the-exact-path-match-matcher-incorrectly-only  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-28. Updated: 2026-09-28  
License: CC BY 4.0 with a link back

CVE-2026-101914 · Severity: medium · CVSS 6.5 · Published 2026-09-28

The gRPC JavaScript library's role-based access control (RBAC) system incorrectly matches API method names when case-insensitive matching is enabled. An attacker can bypass authentication rules by calling a method name that is a prefix of another protected method, potentially gaining unauthorized access to protected gRPC services.

Technologies: [@grpc/grpc-js-xds (npm)](https://junglewise.ai/threats/technologies/grpc-grpc-js-xds). Vendors: [Google](https://junglewise.ai/threats/vendors/google), [npm](https://junglewise.ai/threats/vendors/npm).

## Quick answers

**Is CVE-2026-101914 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-101914 being exploited in the wild.

**How severe is CVE-2026-101914?** Medium severity, with a CVSS score of 6.5, published 28 September 2026.

**Which products and versions are affected?** Google Grpc-Js-Xds < 1.13.1, = 1.14.0; @grpc/grpc-js-xds (npm) SEMVER:introduced=0,fixed=1.13.1.

**Is there a fix for CVE-2026-101914?** Yes. @grpc/grpc-js-xds (npm): upgrade to 1.13.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-101914 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-101914?** Check whether you run Google Grpc-Js-Xds or @grpc/grpc-js-xds (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- @grpc/grpc-js-xds (npm): upgrade to 1.13.1 or later

  ```sh
  npm install @grpc/grpc-js-xds@1.13.1
  ```


## Technical details

The exact path matcher in the RBAC implementation applies a prefix match instead of an exact match for case-insensitive method name comparisons, violating the intended authorization semantics. An unauthenticated network attacker can exploit this by invoking a gRPC method whose name is a prefix of a differently-protected method when case-insensitive matching is configured. The fix applies exact matching logic consistently across both case-sensitive and case-insensitive paths.

## Affected products

- Google grpc-js-xds < 1.13.1, = 1.14.0

## Identifiers

- CVE-2026-101914
- GHSA-88h9-xgvx-hvf2

## Timeline

- 2026-09-17: disclosed
- 2026-09-17: patched: Patches released in versions 1.13.1 and 1.14.1

## References

- [https://api.github.com/users/manqingzhou](https://api.github.com/users/manqingzhou)

## Related threats

- [grpc-js-xds RBAC override policy bypass](https://junglewise.ai/threats/cve-2026-128065-grpc-grpc-js-rbac-override-configs-in-virtualhost-and-route)
- [@grpc/grpc-js implements the core functionality of gRPC purely in JavaScript, without a C++ addon. Before 1.13.2, and from 1.14.0 through 1.](https://junglewise.ai/threats/cve-2026-126367-grpc-grpc-js-safe-regex-incorrectly-applies-partial-string)