CVE-2026-44291
Last modified
CVE-2026-44291 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. 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. EPSS estimates a 0.50% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Protobufjs Project | Protobufjs | < 7.5.6 |
| Protobufjs Project | Protobufjs | >= 8.0.0, < 8.0.2 |
References
- https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-75px-5xx7-5xc7Mitigation, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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