CVE-2026-44288— protobufjs: Overlong UTF-8 decoding
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。
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-2026-44288
Vulnerability Information
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Vulnerability Title
protobufjs: Overlong UTF-8 decoding
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 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: 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
Unicode编码处理不恰当
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
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| protobufjs | protobuf.js | < 7.5.6 | - |
|
II. Public POCs for CVE-2026-44288
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-44288 (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-2026-44294 | 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
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CVE-2026-59876
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CVE-2026-54270
protobufjs: Memory amplification from preserved unknown fiel
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-176
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Net::Whois::Raw versions before 2.99044 for Perl ship a pwho -
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Fireware OS Improper Authorization in Access Portal Reverse -
CVE-2026-93990
Expat before 2.8.5 Malformed UTF-16 Acceptance via Unchecked -
CVE-2026-93751
uri-js through 4.4.1 Improper UTF-8 Decoding via pctDecChars
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