CVE-2026-44290: Protobufjs Project Protobufjs

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.5.6 and 8.0.2, protobufjs allowed certain schema option paths to traverse through inherited object properties while applying options. A crafted protobuf schema or JSON descriptor could cause option handling to write to properties on global JavaScript constructors, corrupting process-wide built-in functionality. This vulnerability is fixed in 7.5.6 and 8.0.2.

Affected products

• Protobufjs Project Protobufjs: before 7.5.6 (fixed in 7.5.6); from 8.0.0, before 8.0.2 (fixed in 8.0.2)

Published 2026-05-13. Last modified 2026-06-17.