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CVE-2026-59877— protobufjs: Denial of Service via infinite loop in .proto option parsing

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.

protobufjs protobuf.js是protobufjs的JavaScript序列化库。 protobufjs protobuf.js 7.6.5之前版本和8.6.6之前版本存在资源管理错误漏洞，该漏洞源于解析选项名称时未检查输入结束，可能导致解析、Root.load或Root.loadSync无限循环。

CVSS 5.3 · Medium EPSS 0.67% · P51

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
protobufjs protobuf.js >= 7.5.0, < 7.6.5 affected
>= 8.0.0, < 8.6.6 affected
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I. Basic Information for CVE-2026-59877

Vulnerability Information
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Vulnerability Title
protobufjs: Denial of Service via infinite loop in .proto option parsing
Source: CVE Program / CVE List V5
Vulnerability Description
protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.6.5 and 8.6.6, protobufjs parsed option names by advancing through schema tokens until reaching an = token without checking for end of input, so a crafted .proto schema that opens an option declaration and ends prematurely can cause parse, Root.load, or Root.loadSync to loop indefinitely. This issue is fixed in versions 7.6.5 and 8.6.6.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5
Vulnerability Title
protobufjs protobuf.js 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
protobufjs protobuf.js是protobufjs的JavaScript序列化库。 protobufjs protobuf.js 7.6.5之前版本和8.6.6之前版本存在资源管理错误漏洞，该漏洞源于解析选项名称时未检查输入结束，可能导致解析、Root.load或Root.loadSync无限循环。
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 >= 7.5.0, < 7.6.5 -

II. Public POCs for CVE-2026-59877

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III. Intelligence Information for CVE-2026-59877

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Patches & Fixes for CVE-2026-59877 (3)

Vendor Advisories for CVE-2026-59877 (1)

Vendor Pages for CVE-2026-59877 (2)

IV. Related Vulnerabilities

Same product: protobuf.js
Same vendor: protobufjs
Same weakness: CWE-835

V. Comments for CVE-2026-59877

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