Vulnerability in Nousresearch Hermes-Agent
CVE-2026-10221
A vulnerability was identified in NousResearch hermes-agent up to 0.12.0. Affected by this vulnerability is the function _compress_context of the file run_agent.py. The manipulation leads to injection. It is possible to initiate the attack remotely. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure but did not respond in any way.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.003 (21.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 22nd percentile — 21.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Nousresearch Hermes-Agent — versions 0.1, 0.2, 0.3
Weakness classification (CWE)
References
- vuldb.com/vuln/367500 (technical-description, vdb-entry)
- vuldb.com/vuln/367500/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-10221 (third-party-advisory)
- vuldb.com/submit/822019 (third-party-advisory)
- gist.github.com/YLChen-007/d343fcfe2c009cd45f56dc475fd5ac03 (exploit)
Frequently asked questions
- What is CVE-2026-10221?
- CVE-2026-10221 is a high-severity vulnerability in Nousresearch Hermes-Agent, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 7.3/10. Published 2026-06-01.
- How severe is CVE-2026-10221?
- High severity. CVSS v3 base score is 7.3 out of 10.