Vulnerability · Published Sep 1, 2026 · Assigned by VulDB
CVE-2026-84287NousResearch hermes-agent Session Chat api_server.py denial of service
Medium 4.3
In plain English
A medium-severity security flaw in hermes-agent from NousResearch. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities).
Official description
A flaw has been found in NousResearch hermes-agent 0.18.0. Affected by this issue is some unknown functionality of the file gateway/platforms/api_server.py of the component Session Chat Interface. This manipulation causes denial of service. The attack is possible to be carried out remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| NousResearch | hermes-agent | 0.18.0 |
Weakness: CWE-404 · Vector: 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
References
- VDB-397718 | NousResearch hermes-agent Session Chat api_server.py denial of service vdb-entry
- VDB-397718 | CTI Indicators (IOB, IOC, TTP, IOA) signature, permissions-required
- CVE-2026-84287 | CVE Analysis and Report third-party-advisory
- Submit #882712 | NousResearch hermes-agent 0.18.0 Denial of Service third-party-advisory
- Submit #882795 | NousResearch hermes-agent 0.18.0 Denial of Service (Duplicate) third-party-advisory
- https://github.com/hackerguopeng/cve/tree/main/Hermes_API_Server_Session_Chat_DoS_Report exploit