CVE-2026-59876
4.8
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| protobufjs | protobuf.js | >= 8.2.0, < 8.6.5 | affected |
Weaknesses
- CWE-1321: CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
References
- https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-jfj6-75fj-8934
- https://github.com/protobufjs/protobuf.js/pull/2335
- https://github.com/protobufjs/protobuf.js/commit/9f97fe413072d3beb52c74e62d88ea8adc9444d8
- https://github.com/protobufjs/protobuf.js/releases/tag/protobufjs-v8.6.5
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