NousResearch hermes-agent prompt_builder.py _scan_context_content injection
Priority HIGH 70CWE-707Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- —
- Confidentiality · integrity · availability
- Low · Low · Low
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub.
Summary
A vulnerability was found in NousResearch hermes-agent 2026.4.23. The impacted element is the function _scan_context_content of the file agent/prompt_builder.py. The manipulation results in injection. The attack may be performed from remote. The exploit has been made public and could be used. The vendor was contacted early about this disclosure but did not respond in any way.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00305 23rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed hermes-agent (PyPI): 0.15.0
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| NousResearch | hermes-agent | 2026.4.23 | — | No fix listed | CNA |
| — | hermes-agent (PyPI) | before 0.15.0 | 0.15.0 | Patch available | GHSA-pgp4-xr4j-h5cg |
- hermes-agent VendorNousResearch Affected 2026.4.23 Fixed in — No fix listed CNA
- hermes-agent (PyPI) Vendor— Affected before 0.15.0 Fixed in 0.15.0 Patch available GHSA-pgp4-xr4j-h5cg
CPE names CNA · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:nousresearch:hermes-agent:*:*:*:*:*:*:*:* | — | — | NousResearch |
- cpe:2.3:a:nousresearch:hermes-agent:*:*:*:*:*:*:*:* Versions — — ·NousResearch
Remediation
- Fix · GHSA-pgp4-xr4j-h5cg hermes-agent (PyPI) Fixed in 0.15.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-9366
- 2026-10-03 Alias added: GHSA-pgp4-xr4j-h5cg
References
More NousResearch vulnerabilities
- TI-2026-50258 Hermes Agent 0.18.2 - 0.21.0 RCE via git core.fsmonitor Config Injection CVSS 4.0HIGH 8.6
- TI-2026-12325 NousResearch hermes-agent Live Webhook Endpoint base.py extract_media path traversal CVSS 4.0MEDIUM 6.9
- TI-2026-08962 NousResearch hermes-agent Webhook Endpoint feishu.py _handle_webhook_request resource consumption CVSS 4.0MEDIUM 6.9
- TI-2026-08959 NousResearch hermes-agent run_agent.py _compress_context injection CVSS 4.0MEDIUM 6.9
- TI-2026-08958 NousResearch hermes-agent skills_tool.py skill_view injection CVSS 4.0MEDIUM 6.9
- TI-2026-08218 NousResearch hermes-agent Environment Variable code_execution_tool.py execute_code sandbox CVSS 4.0MEDIUM 6.9
Sources
- CVE-2026-9366 · CVE Program
- CVE-2026-9366 · NVD
- FIRST EPSS
- GHSA-pgp4-xr4j-h5cg · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences