4.8
Medium
CVE-2026-59876 protobufjs compiles protobuf definitions into JavaScript (JS) functions
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 products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| protobuf.js 8.2 | 8.2.0 → < 8.6.5 | 8.6.5 |
References
- github.com github.com
- github.com github.com
- github.com github.com
- github.com github.com
Timeline
- Published
- Last modified
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CVE-2026-59877
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CVE-2026-48712
protobufjs compiles protobuf definitions into JavaScript (JS) functions
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CVE-2026-54270
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