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.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
protobufjs protobuf.js affected
Version Status Constraints
< 7.5.6 affected —
>= 8.0.0, < 8.0.2 affected —

Configuration 1 [-]

OR cpe:2.3:a:protobufjs_project:protobufjs:*:*:*:*:*:node.js:*:*
cpe:2.3:a:protobufjs_project:protobufjs:*:*:*:*:*:node.js:*:*

No data.

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No data.

Project Subscriptions

Vendors Products
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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-fx83-v9x8-x52w protobuf.js: Prototype injection in generated message constructors
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-fx83-v9x8-x52w cve-icon cve-icon
History

Wed, 13 May 2026 21:00:00 +0000

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

Wed, 13 May 2026 15:15:00 +0000

Type Values Removed Values Added
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.
Title protobufjs: Prototype injection in generated message constructors
Weaknesses CWE-1321
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-05-13T14:42:55.155Z

Reserved: 2026-05-05T17:39:31.112Z

Link: CVE-2026-44292

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Analyzed

Published: 2026-05-13T16:16:56.123

Modified: 2026-05-13T20:58:32.597

Link: CVE-2026-44292

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-13T18:15:16Z

Weaknesses