CVE-2026-84887: simular-ai Agent-S Model-generated GUI Action Execution Workflow grounding.py denial of service

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-03 · updated 2026-09-03
Weakness: CWE-404

Description

A vulnerability was identified in simular-ai Agent-S up to 0.3.2. Affected by this issue is some unknown functionality of the file grounding.py of the component Model-generated GUI Action Execution Workflow. The manipulation leads to denial of service. Remote exploitation of the attack is possible. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure but did not respond in any way.

Affected products

simular-ai Agent-S: 0.3.0, 0.3.1, 0.3.2

References

https://github.com/outlookgp/CVE/tree/main/AgentS_Action_Parameter_Budget_DoS_Report
https://vuldb.com/cve/CVE-2026-84887
https://vuldb.com/submit/886451
https://vuldb.com/vuln/398136
https://vuldb.com/vuln/398136/cti

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