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CVE-2026-34043— Serialize JavaScript has CPU Exhaustion Denial of Service via crafted array-like objects

Quick assessment

Affected
yahoo serialize-javascript
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.

Serialize JavaScript是Yahoo开源的一个将 JavaScript 序列化为包含正则表达式和函数的 JSON 超集。 Serialize JavaScript 7.0.5之前版本存在安全漏洞，该漏洞源于序列化特制的类数组对象时进入消耗100% CPU的密集循环，可能导致拒绝服务。

CVSS 5.9 · Medium EPSS 0.58% · P47

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-34043

Vulnerability Information
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Vulnerability Title
Serialize JavaScript has CPU Exhaustion Denial of Service via crafted array-like objects
Source: CVE Program / CVE List V5
Vulnerability Description
Serialize JavaScript to a superset of JSON that includes regular expressions and functions. Prior to version 7.0.5, there is a Denial of Service (DoS) vulnerability caused by CPU exhaustion. When serializing a specially crafted "array-like" object (an object that inherits from Array.prototype but has a very large length property), the process enters an intensive loop that consumes 100% CPU and hangs indefinitely. This issue has been patched in version 7.0.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Serialize JavaScript 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Serialize JavaScript是Yahoo开源的一个将 JavaScript 序列化为包含正则表达式和函数的 JSON 超集。 Serialize JavaScript 7.0.5之前版本存在安全漏洞，该漏洞源于序列化特制的类数组对象时进入消耗100% CPU的密集循环，可能导致拒绝服务。
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
yahoo serialize-javascript < 7.0.5 -

II. Public POCs for CVE-2026-34043

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III. Intelligence Information for CVE-2026-34043

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Patches & Fixes for CVE-2026-34043 (1)

Vendor Advisories for CVE-2026-34043 (1)

IV. Related Vulnerabilities

Same product: serialize-javascript
Same vendor: yahoo
Same weakness: CWE-400

V. Comments for CVE-2026-34043

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