Vulnerability Report

CVE-2026-44292

Title: protobufjs Prototype Pollution via Message Constructor

Other

Proof Of Concept

No public PoC currently indexed for CVE-2026-44292.

CWE Category CWE-1321

Published Date May 13, 2026

Modified Date May 13, 2026

Exploit Status Not Found

Score 5.3 CVSS v3.1

Exploit Probability (EPSS)

0.20%

Vulnerability Summary

CVE-2026-44292: 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.

Impacted Vendors

protobufjs_project 1

Reference Links

https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-fx83-v9x8-x52w

CVSS v3.1

Source Entity [email protected]

Severity MEDIUM

5.3

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-44292 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

May 13, 2026 MODIFIED

Vulnerability data updated via NVD.

May 13, 2026 MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity LOW

Privileges N/A

Interaction NONE

CVSS Vector String


                                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected Stack

No specific products linked.