CVE-2026-44291

protobufjs: Code generation gadget after prototype pollution

Published May 13, 2026 CVSS 3.1 · 8.1 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-75px-5xx7-5xc7 protobuf.js: Code generation gadget after prototype pollution
History
Type Values Removed Values Added
First Time appeared Protobuf
Protobuf protobuf
Vendors & Products Protobuf
Protobuf protobuf
Type Values Removed Values Added
First Time appeared Protobufjs Project
Protobufjs Project protobufjs
CPEs cpe:2.3:a:protobufjs_project:protobufjs:*:*:*:*:*:node.js:*:*
Vendors & Products Protobufjs Project
Protobufjs Project protobufjs
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title protobufjs: Code generation gadget after prototype pollution
Weaknesses CWE-94
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
May 13, 2026, 3:32 PM
Reserved
May 5, 2026, 5:39 PM
Status
Analyzed
Published
May 13, 2026, 4:16 PM
Modified
Nov 11, 2026, 8:10 PM