CVSS 3.1
8.1 highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:HCVE-2026-44291
High (8.1) in protobufjs project protobufjs. EPSS 0.5% chance of exploitation in the next 30 days. Fixed in protobufjs 7.5.6, 8.0.2.
protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.5.6 and 8.0.2, protobufjs used plain objects with inherited prototypes for internal type lookup tables used by generated encode and decode functions. If Object.prototype had already been polluted, those lookup tables could resolve attacker-controlled inherited properties as valid protobuf type information. This could cause attacker-controlled strings to be emitted into generated JavaScript code. This vulnerability is fixed in 7.5.6 and 8.0.2.
Severity
- EPSS
- 0.5% chance of exploitation in the next 30 days; higher than 42% of CVEs (scores of 2026-10-31)
- CWE
- CWE-94
- Published
- Modified
- Record from
- the NVD, synced
Affected
- protobufjs_project:protobufjs
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-75px-5xx7-5xc7 | npm | protobufjs | <7.5.6 | 7.5.6 |
| GHSA-75px-5xx7-5xc7 | npm | protobufjs | >=8.0.0 <8.0.2 | 8.0.2 |