What is CVE-2026-84202?

CVE-2026-84202 is a high-severity vulnerability in Modelscope, classified under Deserialization of Untrusted Data. CVSS score: 8.8/10. Published 2026-09-01.

How severe is CVE-2026-84202?

High severity. CVSS v3 base score is 8.8 out of 10.

Deserialization in Modelscope

CVE-2026-84202

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.

Vulnerability class: Insecure Deserialization

Published 2026-09-01 · last modified 2026-09-08.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.007 (51.5th percentile), scored 2026-10-17.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 51.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.007 · change: +0.003

Affected products

Modelscope

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

github.com/modelscope/modelscope (product)
github.com/modelscope/modelscope/issues/1660 (issue-tracking)
github.com/modelscope/modelscope/blob/v1.40.0/modelscope/models/audio/tts/voice… (technical-description)
github.com/modelscope/modelscope/blob/v1.40.0/modelscope/models/multi_modal/mpl… (technical-description)
www.vulncheck.com/advisories/modelscope-through-1.40.0-unsafe-yaml-deserializat… (third-party-advisory)

Frequently asked questions

What is CVE-2026-84202?: CVE-2026-84202 is a high-severity vulnerability in Modelscope, classified under Deserialization of Untrusted Data. CVSS score: 8.8/10. Published 2026-09-01.
How severe is CVE-2026-84202?: High severity. CVSS v3 base score is 8.8 out of 10.