Deserialization Vulnerability in FoundationAgents MetaGPT
CVE-2026-10566

4.8MEDIUM

Key Information:

Vendor: Foundationagents
Status: Metagpt
Vendor: CVE Published:; 2 June 2026

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👾 Exploit Exists🟡 Public PoC

What is CVE-2026-10566?

A deserialization vulnerability has been identified in FoundationAgents MetaGPT versions up to 0.8.2. This flaw resides within the Message.check_instruct_content function located in the metagpt/schema.py file. By manipulating the argument mapping, an attacker can exploit the vulnerability, enabling deserialization that could facilitate malicious local execution attacks. Although the project maintainers were alerted to the issue via an early report, no resolution has been provided yet. This could pose significant risks to users, as the exploit is publicly accessible.

Affected Version(s)

MetaGPT 0.8.0

MetaGPT 0.8.1

MetaGPT 0.8.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-10566 - Proof of Concept