CVE-2026-84288

MEDIUM 4.3

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

CVSS Score

4.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-404
Vendor	nousresearch
Product	hermes-agent
Published	Sep 1, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

NousResearch / hermes-agent

0.18.0 0.18.1 0.18.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

vuldb.com: https://vuldb.com/vuln/397719 vuldb.com: https://vuldb.com/vuln/397719/cti vuldb.com: https://vuldb.com/cve/CVE-2026-84288 vuldb.com: https://vuldb.com/submit/882873 github.com: https://github.com/hackerguopeng/cve/tree/main/Hermes_ACP_Queued_Prompt_DoS_Report

Credits

🔍 hackerguopeng (VulDB User) VulDB CNA Team