CVE-2026-44292— protobufjs: Prototype injection in generated message constructors
Quick assessment
Affected
protobufjs protobuf.js
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
protobuf.js是The protobuf.js Project开源的一个纯 JavaScript 实现，具有对node.js和浏览器的TypeScript支持的协议缓冲区实现。它易于使用，速度极快，并且通过.proto文件可以开箱即用！ protobuf.js 7.5.6之前版本和8.0.2之前版本存在安全漏洞，该漏洞源于生成的消息构造函数未过滤__proto__键，可能导致攻击者控制的消息实例原型被修改。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| protobufjs | protobuf.js | < 7.5.6 |
affected |
>= 8.0.0, < 8.0.2 |
affected |
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I. Basic Information for CVE-2026-44292
Vulnerability Information
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Vulnerability Title
protobufjs: Prototype injection in generated message constructors
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5
Vulnerability Title
protobuf.js 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
protobuf.js是The protobuf.js Project开源的一个纯 JavaScript 实现，具有对node.js和浏览器的TypeScript支持的协议缓冲区实现。它易于使用，速度极快，并且通过.proto文件可以开箱即用！ protobuf.js 7.5.6之前版本和8.0.2之前版本存在安全漏洞，该漏洞源于生成的消息构造函数未过滤__proto__键，可能导致攻击者控制的消息实例原型被修改。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| protobufjs | protobuf.js | < 7.5.6 | - |
|
II. Public POCs for CVE-2026-44292
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-44292 (1)
Same Patch Batch · protobufjs · 2026-05-13 · 10 CVEs total
| CVE-2026-44295 | 8.7 HIGH | protobufjs-cli: Code injection in pbjs static output from crafted schema names |
| CVE-2026-44291 | 8.1 HIGH | protobufjs: Code generation gadget after prototype pollution |
| CVE-2026-42290 | 7.8 HIGH | protobufjs-cli: OS Command Injection |
| CVE-2026-44293 | 7.7 HIGH | protobufjs: Code injection through bytes field defaults in generated toObject code |
| CVE-2026-44289 | 7.5 HIGH | protobufjs: Denial of service through unbounded protobuf recursion |
| CVE-2026-44290 | 7.5 HIGH | protobufjs: Process-wide denial of service through unsafe option paths |
| CVE-2026-45740 | 5.3 MEDIUM | protobufjs: Denial of Service via unbounded recursive JSON descriptor expansion |
| CVE-2026-44288 | 5.3 MEDIUM | protobufjs: Overlong UTF-8 decoding |
| CVE-2026-44294 | 5.3 MEDIUM | protobufjs: Denial of service from crafted field names in generated code |
IV. Related Vulnerabilities
Same product: protobuf.js
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CVE-2026-59876
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CVE-2026-48712
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CVE-2026-54270
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Same vendor: protobufjs
-
CVE-2026-59876
protobufjs: Text Format string map parsing can mutate return -
CVE-2026-59877
protobufjs: Denial of Service via infinite loop in .proto op -
CVE-2026-54269
protobufjs: Schema-derived names can shadow runtime-signific -
CVE-2026-48712
protobufjs: Denial of service through unbounded Any expansio -
CVE-2026-54270
protobufjs: Memory amplification from preserved unknown fiel
Same weakness: CWE-1321
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CVE-2026-107353
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CVE-2026-106448
StableLib: Prototype poisoning via `__proto__` map keys in C -
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Payload: Prototype pollution in Payload Import Export plugin -
CVE-2026-104852
GraphQL Tools has prototype pollution in well-established ut -
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Tinypool: Prototype Pollution gadget in worker options leads
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