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CVE-2026-34043

HIGH CVSS 3.1: 7.5 EPSS 0.05%
Updated Apr 03, 2026
Yahoo
Parameter Value
CVSS 7.5 (HIGH)
Affected Versions before 7.0.5
Fixed In 7.0.5
Type CWE-400 (Uncontrolled Resource Consumption), CWE-834
Vendor Yahoo
Public PoC No

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.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service

CVSS Vector v3.1

Vulnerable Products 1

Configuration From (including) Up to (excluding)
Yahoo Serialize
cpe:2.3:a:yahoo:serialize:*:*:*:*:*:*:*:*
7.0.5