CVE-2026-10566: FoundationAgents MetaGPT schema.py Message.check_instruct_content deserialization

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-02 · updated 2026-07-22
Weakness: CWE-20

Description

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.

Affected products

FoundationAgents MetaGPT: 0.8.0, 0.8.1, 0.8.2

References

https://github.com/FoundationAgents/MetaGPT/
https://github.com/FoundationAgents/MetaGPT/issues/2038
https://vuldb.com/cve/CVE-2026-10566
https://vuldb.com/submit/828301
https://vuldb.com/vuln/367673
https://vuldb.com/vuln/367673/cti

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