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CVE-2026-73088— Browserslist: Uncaught crash / prototype write via untrusted browserslist-stats.json custom stats (normalizeStats)

Quick assessment

Affected
browserslist browserslist
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.

Browserslist是Browserslist组织的一款浏览器兼容性配置工具。 Browserslist 4.28.7之前版本存在安全漏洞，该漏洞源于normalizeStats()函数处理不受信任的browserslist-stats.json、opts.stats和CLI --stats数据时，未防护的for...in循环和普通对象括号访问及赋值，允许继承的Object.prototype键（包括__proto__、toString等）导致未捕获的TypeError或修改返回对象的原型。

CVSS 7.5 · High EPSS 0.66% · P50

Possible ATT&CK Techniques 1 AI

T1195 · Supply Chain Compromise

Affected Version Matrix 1

VendorProduct Version RangeStatus
browserslist browserslist < 4.28.7 affected
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I. Basic Information for CVE-2026-73088

Vulnerability Information
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Vulnerability Title
Browserslist: Uncaught crash / prototype write via untrusted browserslist-stats.json custom stats (normalizeStats)
Source: CVE Program / CVE List V5
Vulnerability Description
Browserslist is a configuration tool for sharing target browsers and Node.js versions between front-end tools. Prior to 4.28.7, normalizeStats() in node.js, reached unconditionally through getStat() and loadStat() on every browserslist() call, processes untrusted browserslist-stats.json, opts.stats, and CLI --stats data with an unguarded for...in loop and plain-object bracket access and assignment, allowing inherited Object.prototype keys including __proto__, toString, valueOf, constructor, hasOwnProperty, and isPrototypeOf to cause an uncaught TypeError or modify the prototype of the returned normalized object. This issue is fixed in version 4.28.7.
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:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5
Vulnerability Title
Browserslist 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Browserslist是Browserslist组织的一款浏览器兼容性配置工具。 Browserslist 4.28.7之前版本存在安全漏洞，该漏洞源于normalizeStats()函数处理不受信任的browserslist-stats.json、opts.stats和CLI --stats数据时，未防护的for...in循环和普通对象括号访问及赋值，允许继承的Object.prototype键（包括__proto__、toString等）导致未捕获的TypeError或修改返回对象的原型。
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
browserslist browserslist < 4.28.7 -

II. Public POCs for CVE-2026-73088

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7245 chars
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III. Intelligence Information for CVE-2026-73088

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Patches & Fixes for CVE-2026-73088 (1)

Vendor Advisories for CVE-2026-73088 (1)

Vendor Pages for CVE-2026-73088 (1)

IV. Related Vulnerabilities

Same product: browserslist
Same vendor: browserslist
Same weakness: CWE-1321

V. Comments for CVE-2026-73088

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