High · published May 13, 2026
protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.5.6 and 8.0.2, protobufjs generated JavaScript for toObject conversion could include an unsafe expression derived from a schema-controlled bytes field default value. A crafted descriptor with a non-string default value for a bytes field could cause attacker-controlled code to be emitted into the generated conversion function. This vulnerability is fixed in 7.5.6 and 8.0.2.
| Product | Versions | Fixed in |
|---|---|---|
| protobufjs_project/protobufjs | < 7.5.6 | 7.5.6 |
| protobufjs_project/protobufjs | ≥ 8.0.0, < 8.0.2 | 8.0.2 |