---
id: CVE-2026-54271
aliases:
  - GHSA-pr59-h9ph-3fr8
title: >-
  protobufjs-cli: Code injection in pbjs static output from crafted JSON
  descriptor names
summary: >-
  protobufjs-cli: Code injection in pbjs static output from crafted JSON
  descriptor names
severity: high
cvss: 8.2
cwe:
  - CWE-94
vendor: protobufjs-cli
product: protobufjs-cli
ecosystem: npm
affected:
  - protobufjs-cli <= 1.3.1
  - 'protobufjs-cli >= 2.0.0, <= 2.4.2'
patched:
  - protobufjs-cli 1.3.2
  - protobufjs-cli 2.5.0
published: '2026-06-15'
updated: '2026-06-15'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-pr59-h9ph-3fr8'
references:
  - url: >-
      https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-pr59-h9ph-3fr8
  - url: 'https://github.com/advisories/GHSA-pr59-h9ph-3fr8'
tags:
  - ghsa
  - npm
epss: 0.00303
epssPercentile: 0.23203
ingestedAt: '2026-07-07T15:41:58.666Z'
---

## Overview

## Summary

A previous fix for unsafe name handling in `pbjs` static / static-module code generation was incomplete. Affected versions of `protobufjs-cli` could still emit unsafe JavaScript references when generating static output from crafted JSON descriptor input. The common case of parsing schemas from `.proto` files is not affected.

This is a bypass of GHSA-6r35-46g8-jcw9 / CVE-2026-44295.

## Impact

An attacker who can provide or influence pre-parsed JSON descriptors passed to `pbjs` static code generation may be able to cause generated JavaScript output to contain attacker-controlled code.

The injected code may execute if the generated file is later executed or imported and an affected generated API path is invoked.

## Preconditions

* The application or build process must run `pbjs` static code generation on a pre-parsed JSON descriptor influenced by an attacker.
* The generated JavaScript file must subsequently be executed or imported.
* An affected generated API path must be invoked.

## Workarounds

Do not run affected versions of `pbjs` static or static-module generation on untrusted JSON descriptors. If untrusted JSON descriptors must be accepted, validate descriptor-derived names before code generation and reject names that could not have been produced by parsing a valid `.proto` file. Running code generation in an isolated environment can reduce impact.

## Affected packages

- `protobufjs-cli <= 1.3.1`
- `protobufjs-cli >= 2.0.0, <= 2.4.2`

## Remediation

Upgrade to a patched release:

- `protobufjs-cli 1.3.2`
- `protobufjs-cli 2.5.0`