CVEvulnerability
CVE-2026-59876
4.8 MEDIUM
Official page ↗
- Status
- Analyzed
- Published
- 2026-07-08
- Last modified
- 2026-10-25
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 4.8 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
- CVSS 3.1 ([email protected])
- 4.8 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
- Weaknesses
- CWE-1321
Description
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.
Affected configurations
• protobufjs project protobufjs (>= 8.2.0 < 8.6.5)
Related
Weakness · CWE (1)
- CWE-1321 Improperly Controlled Modification of Object Prototype Attributes weakness
References
- 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