protobufjs compiles protobuf definitions into JavaScript (JS) functions. From 8.2.0 until 8.6.5, the protobufjs Text Format extension parsed string-keyed map entries using ordinary property assignment, allowing a map entry with key __proto__ to change the prototype of the returned map object instead of creating an own map entry in protobufjs/ext/textformat. This issue is fixed in version 8.6.5.
Fix
Patch, vendor advisory and mitigation references on NVD 3
- https://github.com/protobufjs/protobuf.js/commit/9f97fe413072d3beb52c74e62d88ea8adc9444d8 Patch
- https://github.com/protobufjs/protobuf.js/pull/2335 Issue Tracking, Patch
- https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-jfj6-75fj-8934 Mitigation, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 4.8 · protobufjs_projectNVD modified 2026-10-25 17:10
Affected (CPE criteria) 1
cpe:2.3:a:protobufjs_project:protobufjs:*:*:*:*:*:node.js:*:*
References 4
- https://github.com/protobufjs/protobuf.js/commit/9f97fe413072d3beb52c74e62d88ea8adc9444d8 Patch
- https://github.com/protobufjs/protobuf.js/pull/2335 Issue Tracking, Patch
- https://github.com/protobufjs/protobuf.js/releases/tag/protobufjs-v8.6.5 Product, Release Notes
- https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-jfj6-75fj-8934 Mitigation, Vendor Advisory