CVE-2026-71963: Nousresearch Hermes-Agent

High severity, CVSS 8.8. EPSS: 0.9% chance of exploitation in the next 30 days.

Hermes Agent 0.18.2 through 0.21.0, fixed in commit f6234d0, contains a remote code execution vulnerability that allows attackers to execute arbitrary OS commands by supplying a malicious repository with a crafted .git/config that sets core.fsmonitor to an attacker-controlled command. When a user opens the malicious repository and sends any message, the agent triggers a git status index refresh which executes the injected command in the user's process context, exposing the full environment including configured provider API keys.

Affected products

• Nousresearch Hermes-Agent: from 0.18.2, up to and including 0.21.0

Published 2026-09-03. Last modified 2026-09-08.