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High · 8.8 Public exploit CVE-2026-71963 EUVD-2026-70526GHSA-cc88-9pxf-j2wv

Hermes Agent 0.18.2 - 0.21.0 RCE via git core.fsmonitor Config Injection

Published Sep 3, 2026 · Updated Nov 8, 2026 · Assigned by VulnCheck

Vendor: Nous Research Product: hermes-agent

Description

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

VendorProductAffectedFixed
NousResearch hermes-agent 0.18.2 – ≤ 0.21.0 —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

  • Boreas37/CVE-2026-71963-PoC ★ 0 · Sep 27, 2026

    CVE-2026-71963 - Hermes Agent 0.18.2-0.21.0 RCE via a repository-delivered .git/config (core.fsmonitor). Stdlib-only Python, verified on real 0.21.0 with a clean negative control on the fixed build.

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

References