CVE-2026-10566 json
FoundationAgents MetaGPT schema.py Message.check_instruct_content deserialization
published 5mo ago modified 3mo ago also GHSA-3c3g-7hwg-9qmr , PYSEC-2026-2637 , EUVD-2026-33872
- cvss
- 5.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.1%
- EPSS 0.1% chance of exploitation in 30 days, percentile 1%
- public exploits
- 0
- none known
Summary
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.
Is CVE-2026-10566 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 5mo ago
Exploit prediction
0.12% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-09).
Exploits and checks
- github.com https://github.com/FoundationAgents/MetaGPT/issues/2038 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 4.8 | CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P |
| CNA | 3.1 | 5.3 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R |
| CNA | 3.0 | 5.3 | CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R |
| CNA | 2.0 | 4.3 | AV:L/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:ND/RC:UR |
| CNA | 4.0 | 1.9 | CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| CNA | 3.1 | 5.3 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L |
| CNA | 2.0 | 4.3 | AV:L/AC:L/Au:S/C:P/I:P/A:P |
| GitHub | 3.1 | 5.3 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L |
| OSV | 3.1 | 5.3 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | metagpt | <=0.8.2 |
no fix listed |
Affected products
- FoundationAgents MetaGPT
Classification
References
-
github.com
/FoundationAgents/MetaGPT/issues/2038
exploit, issue-tracking, web
-
vuldb.com
/vuln/367673
vdb-entry, technical-description, web
-
vuldb.com
/vuln/367673/cti
signature, permissions-required, web
-
vuldb.com
/cve/CVE-2026-10566
third-party-advisory, web
-
vuldb.com
/submit/828301
third-party-advisory, web
-
github.com
/FoundationAgents/MetaGPT/
product
-
nvd.nist.gov
/vuln/detail/CVE-2026-10566
advisory
-
github.com
/FoundationAgents/MetaGPT
package
-
pypi.org
/project/metagpt
package
-
github.com
/advisories/GHSA-3c3g-7hwg-9qmr
advisory
Sources
- CVE List CVE-2026-10566
- GitHub Advisory GHSA-3c3g-7hwg-9qmr
- NVD CVE-2026-10566
- OSV PYSEC-2026-2637
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.