CVE-2026-34043
Serialize JavaScript has CPU Exhaustion Denial of Service via crafted array-like objects
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.
INFO
Published Date :
March 31, 2026, 3:15 a.m.
Last Modified :
April 3, 2026, 4:53 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-34043
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update the JavaScript library to version 7.0.5 or later.
- Avoid serializing large array-like objects if updating is not possible.
Public PoC/Exploit Available at Github
CVE-2026-34043 has a 4 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-34043.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-34043 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-34043
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
MCP Memory Service for Claude Brain Proxy
Dockerfile Python HTML Shell JavaScript PowerShell Batchfile CSS Slim TypeScript
NV Digital Open Operator System (NV oOS) is an Object-Oriented AI framework for WordPress connecting your data with OpenAI, Gemini, Anthropic, Hugging Face & Ollama (Local) models. It allows you to create & manage AI Assistants that can interact with users, access WordPress (API) data, & perform custom tool functions as a MCP Server & Chat Agent
PHP CSS JavaScript Shell HTML Python
Open-source persistent memory for AI agent pipelines (LangGraph, CrewAI, AutoGen) and Claude. REST API + knowledge graph + autonomous consolidation.
mcp memory semantic-search vector-database claude vector-storage sqlite-vec mcp-server model-context-protocol agent-memory agentic-ai ai-agents autogen crewai knowledge-graph langgraph long-term-memory multi-agent open-source rag
Python Dockerfile Shell HTML Slim JavaScript Batchfile PowerShell CSS TypeScript
Node.js SDK that abstracts the calls to Companies House public APIs
Makefile JavaScript TypeScript
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-34043 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-34043 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 03, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CPE Configuration OR *cpe:2.3:a:yahoo:serialize:*:*:*:*:*:*:*:* versions up to (excluding) 7.0.5 Added Reference Type GitHub, Inc.: https://github.com/yahoo/serialize-javascript/commit/f147e90269b58bb6e539cfdf3d0e20d6ad14204b Types: Patch Added Reference Type GitHub, Inc.: https://github.com/yahoo/serialize-javascript/releases/tag/v7.0.5 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/yahoo/serialize-javascript/security/advisories/GHSA-qj8w-gfj5-8c6v Types: Vendor Advisory -
New CVE Received by [email protected]
Mar. 31, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-400 Added CWE CWE-834 Added Reference https://github.com/yahoo/serialize-javascript/commit/f147e90269b58bb6e539cfdf3d0e20d6ad14204b Added Reference https://github.com/yahoo/serialize-javascript/releases/tag/v7.0.5 Added Reference https://github.com/yahoo/serialize-javascript/security/advisories/GHSA-qj8w-gfj5-8c6v