protobufjs protobuf.js up to 1.3.1/2.4.1 protobufjs-cli code injection

Summaryinfo

A vulnerability was found in protobufjs protobuf.js up to 1.3.1/2.4.1. It has been declared as critical. This affects an unknown part of the component protobufjs-cli. Such manipulation leads to code injection. This vulnerability is referenced as CVE-2026-54271. It is possible to launch the attack remotely. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in protobufjs protobuf.js up to 1.3.1/2.4.1. It has been rated as critical. Affected by this issue is some unknown processing of the component protobufjs-cli. The manipulation with an unknown input leads to a code injection vulnerability. Using CWE to declare the problem leads to CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. Impacted is confidentiality, integrity, and availability. CVE summarizes:

protobufjs-cli is the command line add-on for protobuf.js. Prior to 1.3.2 and 2.5.0, 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 CVE-2026-44295. 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. This vulnerability is fixed in 1.3.2 and 2.5.0.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-54271 since 06/12/2026. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1059 by the MITRE ATT&CK project.

Upgrading to version 1.3.2 or 2.4.2 eliminates this vulnerability.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• JavaScript Library

Vendor

• protobufjs

Name

• protobuf.js

Version

• 1.3.0
• 1.3.1
• 2.4.0
• 2.4.1

Website

• Product: https://github.com/protobufjs/protobuf.js/

CPE 2.3info

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CPE 2.2info

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