CVE-2026-44291— protobufjs: Code generation gadget after prototype pollution
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之前版本存在代码注入漏洞，该漏洞源于使用具有继承原型的普通对象作为内部类型查找表，可能导致攻击者控制的继承属性被解析为有效protobuf类型信息。
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-2026-44291
Vulnerability Information
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Vulnerability Title
protobufjs: Code generation gadget after prototype pollution
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 used plain objects with inherited prototypes for internal type lookup tables used by generated encode and decode functions. If Object.prototype had already been polluted, those lookup tables could resolve attacker-controlled inherited properties as valid protobuf type information. This could cause attacker-controlled strings to be emitted into generated JavaScript code. 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:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
protobuf.js 代码注入漏洞
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之前版本存在代码注入漏洞，该漏洞源于使用具有继承原型的普通对象作为内部类型查找表，可能导致攻击者控制的继承属性被解析为有效protobuf类型信息。
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-2026-44291
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-44291 (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-2026-42290 | 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 |
| CVE-2026-44292 | 5.3 MEDIUM | protobufjs: Prototype injection in generated message constructors |
IV. Related Vulnerabilities
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CVE-2026-59876
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CVE-2026-54270
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Same vendor: protobufjs
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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
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Same weakness: CWE-94
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