PT-2026-49586 · Npm · Protobufjs-Cli

Published

2026-06-15

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Updated

2026-06-15

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CVE-2026-54271

CVSS v3.1

8.2

High

VectorAV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:L

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.

Fix

Code Injection

Weakness Enumeration

CWE-94

Related Identifiers

CVE-2026-54271
GHSA-PR59-H9PH-3FR8

Affected Products

Protobufjs-Cli