Improper Output Encoding in Protobuf.js Command Line Tool
CVE-2026-44295

8.7HIGH

Key Information:

Vendor

Protobufjs

Status
Protobuf.js
Vendor
CVE Published:
13 May 2026

What is CVE-2026-44295?

The protobufjs-cli, a command line tool for protobuf.js, has a vulnerability that allows unsafe JavaScript identifiers to be produced from schema-controlled names prior to versions 1.2.1 and 2.0.2. When static JavaScript is generated from a manipulated schema or JSON descriptor, inadequate sanitization permits certain namespace, enum, service, or derived full names to be improperly written into the output. This poses a risk as it could be exploited to execute arbitrary code or disrupt application functionality.

Affected Version(s)

protobuf.js >= 2.0.0, < 2.0.2 < 2.0.0, 2.0.2

protobuf.js < 1.2.1 < 1.2.1

References

https://github.com/protobufjs/protobuf.js/security/adviso...
x_refsource_CONFIRM

CVSS V3.1

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.