Vulnerability in Nousresearch Hermes-agent
CVE-2026-9354
A vulnerability was detected in NousResearch hermes-agent up to 2026.4.16. The affected element is an unknown function of the component Slack Agent/Mattermost Agent. The manipulation of the argument format_message results in escaping of ou…
EPSS: 0.001 (18.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L.
Affected products
- Nousresearch Hermes-agent — versions 2026.4.0, 2026.4.1, 2026.4.2
Weakness classification (CWE)
References
- cna@vuldb.com (technical-description, vdb-entry)
- cna@vuldb.com (signature, permissions-required)
- cna@vuldb.com (third-party-advisory)
- cna@vuldb.com (exploit)
Frequently asked questions
- What is CVE-2026-9354?
- CVE-2026-9354 is a medium-severity vulnerability in Nousresearch Hermes-agent, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 6.5/10. Published 2026-05-24.
- How severe is CVE-2026-9354?
- Medium severity. CVSS v3 base score is 6.5 out of 10.