CVE-2026-84287

NousResearch hermes-agent Session Chat api_server.py denial of service

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

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

0.38% chance of exploitation in the next 30 days, 31st percentile

Published

2026-09-01

Proof-of-concept exploits (1)

• hackerguopeng/cve/tree/main/Hermes_API_Server_Session_Chat_DoS_Report

References

• CVE Record
• NVD entry

Related

• CVE-2026-84288
• CVE-2026-84425
• CVE-2026-84856
• CVE-2026-84886