FoundationAgents MetaGPT — Deserialization (CVE-2026-10566)
Date: 2026-06
Attack vector: deserialization
Category: vulnerability-disclosure
Severity: High
CVE: CVE-2026-10566
CVE-2026-11455
CVE-2026-5970
CVE-2026-5971
CVE-2026-5972
CVE-2026-5973
CVE-2026-5974
CVE-2026-6109
CVE-2026-6110
CVE-2026-6111
CWE: CWE-20
CWE-352
CWE-502
CWE-74
CWE-77
CWE-78
CWE-862
CWE-918
CWE-94
CWE-95
CVSS: 5.3 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L)

A weakness has been identified in FoundationAgents MetaGPT up to 0.8.2. This affects the function Message.check_instruct_content of the file metagpt/schema.py. Executing a manipulation of the argument mapping can lead to deserialization. The attack is restricted to local execution. The exploit has been made available to the public and could be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.


Mitigations:

Architectural layers (MAESTRO):