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Vulnerability record · CVE-2026-84202 · published 1 September 2026

CVE-2026-84202: Deserialization of untrusted data vulnerability

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.

8.7 CVSS 4.0 High EPSS 0.68% · top 49.5% CWE-502 · Deserialization of untrusted data Deferred
8.7CVSS 4.0 base score
0.68%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
6References
8 Sep 2026Last modified by NVD

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.

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/E:X/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:

References

LinkTags
https://github.com/modelscope/modelscope
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://github.com/modelscope/modelscope/issues/1660
https://www.vulncheck.com/advisories/modelscope-through-1.40.0-unsafe-yaml-deserialization-in-model-config-loading
https://github.com/modelscope/modelscope/issues/1660

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Source: NIST National Vulnerability Database (record CVE-2026-84202), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.