CVE-2026-84288

NousResearch hermes-agent ACP Prompt Workflow session.py HermesACPAgent.prompt denial of service

A vulnerability has been found in NousResearch hermes-agent up to 0.18.2. This affects the function HermesACPAgent.prompt of the file acp_adapter/session.py of the component ACP Prompt Workflow. Such manipulation leads to denial of service. The attack may be performed from remote. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Affected

NousResearch · hermes-agent

CVSS v4.0 VULDB

2.1 LOWCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/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

CVSS v3.1 VULDB

4.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

CVSS v2.0 VULDB

4.0 MEDIUMAV:N/AC:L/Au:S/C:N/I:N/A:P

EPSS

0.27% chance of exploitation in the next 30 days, 19th percentile

Published

2026-09-01

Updated

2026-09-02

Proof-of-concept exploits (1)

• hackerguopeng/cve/tree/main/Hermes_ACP_Queued_Prompt_DoS_Report

References

• CVE Record
• NVD entry

Related

• CVE-2026-84287
• CVE-2026-84425
• CVE-2026-84856
• CVE-2026-84886