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CVE-2026-44288— protobufjs: Overlong UTF-8 decoding

CVSS 5.3 · Medium EPSS 0.03% · P8

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProductVersion RangeStatus
protobufjsprotobuf.js< 7.5.6affected
>= 8.0.0, < 8.0.2affected
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I. Basic Information for CVE-2026-44288

Vulnerability Information
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Vulnerability Title
protobufjs: Overlong UTF-8 decoding
Source: NVD (National Vulnerability Database)
Vulnerability Description
protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.5.6 and 8.0.2, protobufjs includes a minimal UTF-8 decoder that accepted overlong UTF-8 byte sequences and decoded them to their canonical characters instead of replacing them. An attacker who can provide protobuf binary data decoded through the affected UTF-8 path may be able to bypass application-level checks that inspect raw bytes before protobuf string decoding. For example, bytes that do not contain certain ASCII characters could decode to strings containing those characters. This vulnerability is fixed in 7.5.6 and 8.0.2.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
Unicode编码处理不恰当
Source: NVD (National Vulnerability Database)
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UTF-8解码器接受过长的UTF-8字节序列并将其解码为规范字符，可能导致攻击者绕过应用级检查。
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

VendorProductAffected VersionsCPESubscribe
protobufjsprotobuf.js < 7.5.6 -

II. Public POCs for CVE-2026-44288

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III. Intelligence Information for CVE-2026-44288

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Same Patch Batch · protobufjs · 2026-05-13 · 10 CVEs total

CVE-2026-442958.7 HIGHprotobufjs-cli: Code injection in pbjs static output from crafted schema names
CVE-2026-442918.1 HIGHprotobufjs: Code generation gadget after prototype pollution
CVE-2026-422907.8 HIGHprotobufjs-cli: OS Command Injection
CVE-2026-442897.5 HIGHprotobufjs: Denial of service through unbounded protobuf recursion
CVE-2026-442907.5 HIGHprotobufjs: Process-wide denial of service through unsafe option paths
CVE-2026-457405.3 MEDIUMprotobufjs: Denial of Service via unbounded recursive JSON descriptor expansion
CVE-2026-442945.3 MEDIUMprotobufjs: Denial of service from crafted field names in generated code
CVE-2026-442925.3 MEDIUMprotobufjs: Prototype injection in generated message constructors
CVE-2026-44293protobufjs: Code injection through bytes field defaults in generated toObject code

IV. Related Vulnerabilities

Same product: protobuf.js
Same vendor: protobufjs
Same weakness: CWE-176

V. Comments for CVE-2026-44288

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