Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-44293— protobufjs: Code injection through bytes field defaults in generated toObject code

Quick assessment

Affected
protobufjs protobuf.js
Exploitation
Public or AI PoC available; prioritize validation
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toObject转换生成的JavaScript包含来自模式控制字节字段默认值的不安全表达式，可能导致攻击者控制的代码被注入生成的转换函数。

CVSS 7.7 · High EPSS 0.73% · P53

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 2

VendorProduct Version RangeStatus
protobufjs protobuf.js < 7.5.6 affected
>= 8.0.0, < 8.0.2 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-44293

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
protobufjs: Code injection through bytes field defaults in generated toObject code
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 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.
Source: CVE Program / CVE List V5
CVSS Information
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
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toObject转换生成的JavaScript包含来自模式控制字节字段默认值的不安全表达式，可能导致攻击者控制的代码被注入生成的转换函数。
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-2026-44293

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7745 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-44293

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-44293 (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-2026-44289 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

Same product: protobuf.js
Same vendor: protobufjs
Same weakness: CWE-94

V. Comments for CVE-2026-44293

No comments yet

Leave a comment