CVE-2026-44292
Medium
Description
protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.5.6 and 8.0.2, protobufjs generated message constructors copied enumerable properties from a provided properties object without filtering the __proto__ key. If an application constructed a message from an attacker-controlled plain object, an own enumerable __proto__ property could alter the prototype of that individual message instance. This vulnerability is fixed in 7.5.6 and 8.0.2.
SeverityMedium
CVSS5.3
Exploit probability—
ProductProtobufjs
PublishedMay 13, 2026
First seenMay 13, 2026
Weakness typeCWE-1321Prototype pollution
How to fix
Update
- protobufjs_project protobufjs7.5.6, 8.0.2 or later
- protobufjs7.5.6, 8.0.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| protobufjs_project protobufjs | v < 7.5.6, 8.0.0 ≤ v < 8.0.2 | 7.5.6, 8.0.2 |
| protobufjsnpm | v < 7.5.6, 8.0.0 ≤ v < 8.0.2 | 7.5.6, 8.0.2 |
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