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.

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

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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Project Subscriptions

Vendors Products
Protobufjs Project Subscribe
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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-66ff-xgx4-vchm protobuf.js: Code injection through bytes field defaults in generated toObject code
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-66ff-xgx4-vchm 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
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

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 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.
Title protobufjs: Code injection through bytes field defaults in generated toObject code
Weaknesses CWE-94
References
Metrics cvssV4_0

{'score': 7.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-05-13T14:43:33.342Z

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

Link: CVE-2026-44293

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Analyzed

Published: 2026-05-13T16:16:56.253

Modified: 2026-05-13T20:56:57.980

Link: CVE-2026-44293

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-13T17:45:25Z

Weaknesses