CVE-2026-71963 Hermes Agent 0.18.2 - 0.21.0 RCE via git core.fsmonitor Config Injection
Attackers can execute arbitrary OS commands and steal API keys by tricking users into opening a malicious repository with a crafted git config.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-71963?
CVE-2026-71963 is a high-severity command injection vulnerability in NousResearch hermes-agent, published on 3 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-78
Which versions are affected by CVE-2026-71963?
How do I fix CVE-2026-71963?
No fix has been published for CVE-2026-71963 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-71963 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-71963 exists.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-cc88-9pxf-j2wv.