Vulnerability DatabaseCVE-2026-44292
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CVE-2026-44292
Published:May 13, 2026
Updated:May 18, 2026
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.
Affected Packages
protobufjs (CDN_JS):
Affected version(s) =8.0.0-experimental <8.0.2
Fix Suggestion:
Update to version 8.0.2
protobufjs (CDN_JS):
Affected version(s) >=6.10.3 <7.5.6
Fix Suggestion:
Update to version 7.5.6
https://github.com/protobufjs/protobuf.js.git (GITHUB):
Affected version(s) >=protobufjs-v8.0.0 <protobufjs-v8.0.2
Fix Suggestion:
Update to version protobufjs-v8.0.2
https://github.com/protobufjs/protobuf.js.git (GITHUB):
Affected version(s) >=protobufjs-v7.0.0 <protobufjs-v7.5.6
Fix Suggestion:
Update to version protobufjs-v7.5.6
protobufjs (NPM):
Affected version(s) >=0.0.0 <7.5.6
Fix Suggestion:
Update to version 7.5.6
protobufjs (NPM):
Affected version(s) >=8.0.0 <8.0.2
Fix Suggestion:
Update to version 8.0.2
protobufjs (NPM):
Affected version(s) >=8.0.0 <8.0.2
Fix Suggestion:
Update to version 8.0.2
Additional Notes
The description of this vulnerability differs from MITRE.
Related Resources (5)
https://github.com/protobufjs/protobuf.js/releases/tag/protobufjs-v8.0.2
https://github.com/protobufjs/protobuf.js
https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-fx83-v9x8-x52w
https://nvd.nist.gov/vuln/detail/CVE-2026-44292
https://github.com/protobufjs/protobuf.js/releases/tag/protobufjs-v7.5.6
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CVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
CWE-1321
EPSS
Base Score:
0.06