RCE in Nousresearch Hermes-Agent
CVE-2026-71963
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.
Vulnerability class: Command Injection (OS Command Injection)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.009 (57.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 57.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/NousResearch/hermes-agent/commit/f6234d00c5d59450adea1d7edd30ad38593… (patch)
- github.com/NousResearch/hermes-agent/pull/101483 (issue-tracking)
- www.manifold.security/blog/ai-coding-agents-git-hijack (technical-description, exploit)
- www.vulncheck.com/advisories/hermes-agent-rce-via-git-core-fsmonitor-config-inj… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-71963?
- CVE-2026-71963 is a high-severity vulnerability in Nousresearch Hermes-Agent, classified under OS Command Injection. CVSS score: 8.8/10. Published 2026-09-03.
- How severe is CVE-2026-71963?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2026-71963 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.